Update ghcr.io/element-hq/element-web:develop Docker digest to e29b408 (#4215)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

.github/workflows/publish-embedded-packages.yaml

@@ -9,7 +9,7 @@ on:
       - opened
       - labeled
   push:
-    branches: [livekit]
+    branches: [main]
 
 jobs:
   versioning:

.github/workflows/sync-labels.yml

@@ -4,12 +4,12 @@ on:
 
   push:
     branches:
-      - livekit
+      - main
     paths:
       - .github/labels.yml
       - .github/workflows/sync-labels.yml
 
-permissions: {} # We use ELEMENT_BOT_TOKEN instead
+permissions: {} # We use LABEL_SYNC_GITHUB_TOKEN instead
 
 jobs:
   sync-labels:
@@ -20,4 +20,4 @@ jobs:
       DELETE: true
       WET: true
     secrets:
-      ELEMENT_BOT_TOKEN: ${{ secrets.ELEMENT_BOT_TOKEN }}
+      ELEMENT_BOT_TOKEN: ${{ secrets.LABEL_SYNC_GITHUB_TOKEN }}

.github/workflows/test.yaml

@@ -2,7 +2,7 @@ name: Test
 on:
   pull_request: {}
   push:
-    branches: [livekit]
+    branches: [main]
 jobs:
   vitest:
     name: Run unit tests

.github/workflows/translations-upload.yaml

@@ -2,7 +2,7 @@ name: Upload translation files to Localazy
 on:
   push:
     branches:
-      - livekit
+      - main
     paths-ignore:
       - ".github/**"
 

.github/workflows/zizmor.yml

@@ -2,7 +2,7 @@ name: GitHub Actions Security Analysis with zizmor 🌈
 
 on:
   push:
-    branches: ["livekit", "full-mesh"]
+    branches: ["main", "full-mesh"]
   pull_request: {}
 
 permissions: {}

config/config.devenv.json

@@ -5,9 +5,6 @@
       "server_name": "synapse.m.localhost"
     }
   },
-  "features": {
-    "feature_use_device_session_member_events": true
-  },
   "ssla": "https://static.element.io/legal/element-software-and-services-license-agreement-uk-1.pdf",
   "matrix_rtc_session": {
     "wait_for_key_rotation_ms": 3000,

config/config.sample.json

@@ -8,9 +8,6 @@
   "livekit": {
     "livekit_service_url": "https://livekit-jwt.mydomain.com"
   },
-  "features": {
-    "feature_use_device_session_member_events": true
-  },
   "ssla": "https://static.element.io/legal/element-software-and-services-license-agreement-uk-1.pdf",
   "matrix_rtc_mode": "compatibility",
   "matrix_rtc_session": {

docker-compose-playwright.yml

@@ -13,7 +13,7 @@ services:
       - ./backend/playwright_homeserver-othersite.yaml:/data/cfg/homeserver.yaml:Z
   element-web:
     # Pin to a SHA so that upstream cannot break our tests. Renovate handles regular updates.
-    image: ghcr.io/element-hq/element-web:develop@sha256:af44e1e18bdd363a3332a577c3af66a9dde4ad352508a42ee5012c4a9528b30d
+    image: ghcr.io/element-hq/element-web:develop@sha256:e29b408ce1959506962952356e6772cb8052dc6a04dcc8e0b3572026ee8fad6f
   element-web-1:
     # Pin to a SHA so that upstream cannot break our tests. Renovate handles regular updates.
-    image: ghcr.io/element-hq/element-web:develop@sha256:af44e1e18bdd363a3332a577c3af66a9dde4ad352508a42ee5012c4a9528b30d
+    image: ghcr.io/element-hq/element-web:develop@sha256:e29b408ce1959506962952356e6772cb8052dc6a04dcc8e0b3572026ee8fad6f

docs/README.md

@@ -5,5 +5,6 @@ This folder contains documentation for setup, usage, and development of Element
 - [Embedded vs standalone mode](./embedded_standalone.md)
 - [Url format and parameters](./url_params.md)
 - [Global JS controls](./controls.md)
+- [MatrixRTC modes](./matrix_rtc_modes.md)
 - [Self-Hosting](./self_hosting.md)
 - [Developing with linked packages](./linking.md)

docs/matrix_rtc_modes.md

@@ -0,0 +1,48 @@
+# MatrixRTC modes
+
+Element Call is in the middle of a transition of how a call session is
+represented: from room _state_ events (`org.matrix.msc3401.call.member`) to
+_sticky_ events
+([MSC4354](https://github.com/matrix-org/matrix-spec-proposals/pull/4354)),
+which are a much better fit for the short lived, per-device nature of call
+memberships.
+
+Not every homeserver supports sticky events yet. The two MatrixRTC modes
+controls whether Element Call uses them.
+
+## The modes
+
+| Mode            | Membership events | SFU selection | JWT endpoint                 |
+| --------------- | ----------------- | ------------- | ---------------------------- |
+| `compatibility` | state events      | multi SFU     | legacy                       |
+| `matrix_2_0`    | sticky events     | multi SFU     | Matrix 2.0 (hashed identity) |
+
+**`compatibility`** — multi SFU, but still state events. Use it when the
+homeserver does not support sticky events. This is the default.
+
+**`matrix_2_0`** — the target state. Requires a homeserver that advertises
+MSC4354 and all clients on v0.17.0 or later. The local membership requests its
+token from the Matrix 2.0 JWT endpoint of the
+[MatrixRTC Authorization Service](https://github.com/element-hq/lk-jwt-service)
+and identifies the room by a hashed identity instead of a `livekit_alias`.
+(Remote memberships always try the new endpoint first and fall back to the
+legacy one, so remote participants can be on either.)
+
+## Selecting a mode
+
+Users can choose a mode under **Settings → Developer → MatrixRTC mode**. The
+Matrix 2.0 option is disabled if the homeserver does not support sticky events.
+
+A deployment can pin the mode for all its clients in `config.json`, which
+disables the Developer Settings choice:
+
+```json
+{
+  "matrix_rtc_mode": "compatibility"
+}
+```
+
+Valid values are `compatibility` and `matrix_2_0`; an invalid value is
+ignored (with a warning) and the user's choice applies. Pinning `matrix_2_0` on a
+homeserver without sticky event support makes joining fail with a "sticky events
+required" error.

docs/self_hosting.md

@@ -16,7 +16,7 @@
 The following [MSCs](https://github.com/matrix-org/matrix-spec-proposals) are
 required for Element Call to work properly:
 
-- **[MSC3266](https://github.com/deepbluev7/matrix-doc/blob/room-summaries/proposals/3266-room-summary.md):
+- **[MSC3266](https://github.com/deepbluev7/matrix-doc/blob/room-summaries/proposals/3266-room-summary.md)
   Room Summary API**: In Standalone mode Element Call is able to join rooms
   over federation using knocking. In this context MSC3266 is required as it
   allows to request a room summary of rooms you are not joined. The summary
@@ -29,19 +29,26 @@ required for Element Call to work properly:
   signalling. If disabled it is very likely that you end up with stuck calls in
   Matrix rooms.
 
+- **[MSC4519](https://github.com/matrix-org/matrix-spec-proposals/blob/travis/msc/voip-transports-registry/proposals/4519-rtc-transports-registry.md)
+  MatrixRTC Transports Registry**: Defines an endpoint that clients can use to
+  query the available MatrixRTC transports (i.e. find your LiveKit SFU).
+
 - **[MSC4222](https://github.com/matrix-org/matrix-spec-proposals/blob/erikj/sync_v2_state_after/proposals/4222-sync-v2-state-after.md)
   Adding `state_after` to sync v2**: Allow clients to opt-in to a change of the
   sync v2 API that allows them to correctly track the state of the room. This is
   required by Element Call to track room state reliably.
 
 If you're using [Synapse](https://github.com/element-hq/synapse/) as your
-homeserver, you'll need to additionally add the following config items to
-`homeserver.yaml` to comply with Element Call:
+homeserver, you can configure these features by adding the following entries to
+`homeserver.yaml`:
 
 ```yaml
 experimental_features:
   # MSC3266: Room summary API. Used for knocking over federation
   msc3266_enabled: true
+  # MSC4143: MatrixRTC. For historical reasons this flag enables the transports
+  # endpoint defined in MSC4519.
+  msc4143_enabled: true
   # MSC4222 needed for syncv2 state_after. This allow clients to
   # correctly track the state of the room.
   msc4222_enabled: true
@@ -61,6 +68,15 @@ rc_delayed_event_mgmt:
   # Currently the heart-beat is every 5 seconds which translates into a rate of 0.2Hz
   per_second: 1
   burst_count: 20
+
+matrix_rtc:
+  transports:
+    # The transport you specify will be made available to clients over the
+    # /_matrix/client/unstable/org.matrix.msc4143/rtc/transports endpoint as
+    # defined in MSC4519.
+    - type: livekit
+      # Replace this with the actual URL of your MatrixRTC Authorization Service
+      livekit_service_url: https://matrix-rtc.example.com/livekit/jwt
 ```
 
 As a prerequisite for the
@@ -187,23 +203,6 @@ backend mxrtc_auth_backend
 
 ```
 
-#### MatrixRTC transport announcement
-
-Enable the unstable feature flag `msc4143_enabled`, and update the
-[`matrix_rtc` section](https://element-hq.github.io/synapse/latest/usage/configuration/config_documentation.html#matrix_rtc)
-of your Synapse config file:
-
-```yaml
-matrix_rtc:
-  transports:
-    - type: livekit
-      livekit_service_url: https://matrix-rtc.example.com/livekit/jwt
-```
-
-The transport you specify will be made available to clients over the
-`/_matrix/client/unstable/org.matrix.msc4143/rtc/transports` endpoint as defined
-in [MSC4143](https://github.com/matrix-org/matrix-spec-proposals/pull/4143).
-
 ## Building Element Call
 
 > [!NOTE]  

locales/en/app.json

@@ -80,10 +80,6 @@
         "description": "Compatible with homeservers that do not support sticky events (but all other EC clients are v0.17.0 or later)",
         "label": "Compatibility: state events & multi SFU"
       },
-      "Legacy": {
-        "description": "Compatible with old versions of EC that do not support multi SFU",
-        "label": "Legacy: state events & oldest membership SFU"
-      },
       "Matrix_2_0": {
         "description": "Compatible only with homservers supporting sticky events and all EC clients v0.17.0 or later",
         "label": "Matrix 2.0: sticky events & multi SFU"

playwright/spa-helpers.ts

@@ -101,9 +101,7 @@ async function setRtcModeFromSettings(
 
   // Move to Developer tab now
   await page.getByRole("tab", { name: "Developer" }).click();
-  if (mode == "legacy") {
-    await page.getByText("Legacy: state events").click();
-  } else if (mode == "2_0") {
+  if (mode == "2_0") {
     await page.getByText("Matrix 2.0").click();
   } else {
     // compat

playwright/widget/federated-call.test.ts

@@ -12,9 +12,7 @@ import { HOST1, HOST2, type RtcMode, TestHelpers } from "./test-helpers";
 
 const modePairs: [RtcMode, RtcMode][] = [
   ["compat", "compat"],
-  ["legacy", "legacy"],
-  ["legacy", "compat"],
-  ["compat", "legacy"],
+  // TODO: Compatibility + Matrix 2.0?
 ];
 
 modePairs.forEach(([rtcMode1, rtcMode2]) => {

playwright/widget/federation-oldest-membership-bug.spec.ts

@@ -1,85 +0,0 @@
-/*
-Copyright 2026 Element Creations Ltd.
-
-SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial
-Please see LICENSE in the repository root for full details.
-*/
-
-import { expect, test } from "@playwright/test";
-
-import { widgetTest } from "../fixtures/widget-user";
-import { HOST1, HOST2, TestHelpers } from "./test-helpers";
-
-widgetTest(
-  "Bug new joiner was not publishing on correct SFU",
-  async ({ addUser, browserName }) => {
-    test.skip(
-      browserName === "firefox",
-      "This is a bug in the old widget, not a browser problem.",
-    );
-
-    test.slow();
-
-    // 2 users in federation
-    const florian = await addUser("floriant", HOST1);
-    const timo = await addUser("timo", HOST2);
-
-    // Florian creates a room and invites Timo to it
-    const roomName = "Call Room";
-    await TestHelpers.createRoom(roomName, florian.page, [timo.mxId]);
-
-    // Timo joins the room
-    await TestHelpers.acceptRoomInvite(roomName, timo.page);
-
-    // Ensure we are in legacy mode (should be the default)
-    await TestHelpers.openWidgetSetEmbeddedElementCallRtcModeCloseWidget(
-      florian.page,
-      "legacy",
-    );
-    await TestHelpers.openWidgetSetEmbeddedElementCallRtcModeCloseWidget(
-      timo.page,
-      "legacy",
-    );
-
-    // Let timo create a call
-    await TestHelpers.startCallInCurrentRoom(timo.page, false);
-    await TestHelpers.joinCallFromLobby(timo.page);
-
-    // We want to simulate that the oldest membership authentication is way slower than
-    // the preffered auth.
-    // In this setup, timo advertised$ transport will be it's own, and the active will be the one from florian
-    await florian.page.route(
-      "**/matrix-rtc.othersite.m.localhost/livekit/jwt/**",
-      async (route) => {
-        await new Promise((resolve) => setTimeout(resolve, 2000)); // 5 second delay
-        await route.continue();
-      },
-    );
-
-    // Florian joins the call
-    await expect(florian.page.getByTestId("join-call-button")).toBeVisible();
-    await florian.page.getByTestId("join-call-button").click();
-    await TestHelpers.joinCallFromLobby(florian.page);
-
-    await florian.page.waitForTimeout(3000);
-    await timo.page.waitForTimeout(3000);
-
-    // We should see 2 video tiles everywhere now
-    for (const user of [timo, florian]) {
-      const frame = user.page
-        .locator('iframe[title="Element Call"]')
-        .contentFrame();
-      await expect(frame.getByTestId("videoTile")).toHaveCount(2);
-
-      // No one should be waiting for media
-      await expect(frame.getByText("Waiting for media...")).not.toBeVisible();
-
-      // There should be 2 video elements, visible and autoplaying
-      await expect(frame.locator("video")).toHaveCount(2, {
-        timeout: 10000,
-      });
-
-      await TestHelpers.expectVisibleVideoCount(frame, 2);
-    }
-  },
-);

playwright/widget/hotswap-legacy-compat.test.ts

@@ -1,91 +0,0 @@
-/*
-Copyright 2026 Element Creations Ltd.
-
-SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial
-Please see LICENSE in the repository root for full details.
-*/
-
-import { expect, test } from "@playwright/test";
-
-import { widgetTest } from "../fixtures/widget-user";
-import { HOST1, HOST2, TestHelpers } from "./test-helpers";
-
-// ## Issue
-// This test reproduces an issue with the publisher.
-// When switching local focus, we need to recreate the publisher.
-// This failed because of a dead lock in the old publishers destruction.
-//
-// There are numerus ways to enforece this situation:
-//  - oldest member swap (manually set the oldest member focus and leave with the prev oldest member)
-//    This almost never happens in the real worls since clients will set their preferredFoci list to what the oldest member is.
-//  - switch from oldest member to multi sfu as the NOT the first joiner + the first joiner is on a different sfu than your preferred sfu.
-//
-// This test uses the "switch from oldest member to multi sfu" approach.
-//
-// It is a copy of federated-call.test.ts in the `["legacy", "legacy"]` setup,
-// which once connected will make the second user switch to multi sfu.
-widgetTest(
-  `Test swapping publisher from ${HOST1} to ${HOST2}`,
-  async ({ addUser, browserName }) => {
-    test.slow();
-    test.skip(
-      browserName === "firefox",
-      "The is test is not working on firefox CI environment. No mic/audio device inputs so cam/mic are disabled",
-    );
-
-    const florian = await addUser("floriant", HOST1);
-    const timo = await addUser("timo", HOST2);
-
-    const roomName = "Call Room";
-
-    await TestHelpers.createRoom(roomName, florian.page, [timo.mxId]);
-
-    await TestHelpers.acceptRoomInvite(roomName, timo.page);
-
-    await florian.page.pause();
-
-    await TestHelpers.openWidgetSetEmbeddedElementCallRtcModeCloseWidget(
-      florian.page,
-      "legacy",
-    );
-    await TestHelpers.openWidgetSetEmbeddedElementCallRtcModeCloseWidget(
-      timo.page,
-      "legacy",
-    );
-
-    await TestHelpers.startCallInCurrentRoom(florian.page, false);
-    await TestHelpers.joinCallFromLobby(florian.page);
-
-    // timo joins
-    await TestHelpers.joinCallInCurrentRoom(timo.page);
-
-    // We should see 2 video tiles everywhere now
-    for (const user of [timo, florian]) {
-      const frame = user.page
-        .locator('iframe[title="Element Call"]')
-        .contentFrame();
-      await expect(frame.getByTestId("videoTile")).toHaveCount(2);
-
-      // Wait for "Waiting for media..." to disappear (with timeout)
-      await expect(frame.getByText("Waiting for media...")).not.toBeVisible({
-        timeout: 10000, // Maximum time to wait
-      });
-
-      // There should be 2 video elements, visible and autoplaying
-      await expect(frame.locator("video")).toHaveCount(2, {
-        timeout: 10000,
-      });
-
-      await TestHelpers.expectVisibleVideoCount(frame, 2);
-    }
-
-    // now we switch the mode for timo (second joiner on multi-sfu HOST2 but currently HOST1)
-    await TestHelpers.setEmbeddedElementCallRtcMode(timo.page, "compat");
-    await timo.page.waitForTimeout(3000);
-
-    await TestHelpers.expectVisibleVideoCount(
-      timo.page.locator('iframe[title="Element Call"]').contentFrame(),
-      2,
-    );
-  },
-);

playwright/widget/test-helpers.ts

@@ -21,7 +21,7 @@ const PASSWORD = "foobarbaz1!";
 export const HOST1 = "https://app.m.localhost/#/welcome";
 export const HOST2 = "https://app.othersite.m.localhost/#/welcome";
 
-export type RtcMode = "legacy" | "compat" | "2_0";
+export type RtcMode = "compat" | "2_0";
 
 export class TestHelpers {
   public static async startCallInCurrentRoom(
@@ -309,9 +309,7 @@ export class TestHelpers {
 
     // Move to Developer tab now
     await iframe.getByRole("tab", { name: "Developer" }).click();
-    if (mode == "legacy") {
-      await iframe.getByText("Legacy: state events").click();
-    } else if (mode == "2_0") {
+    if (mode == "2_0") {
       await iframe.getByText("Matrix 2.0").click();
     } else {
       // compat

pnpm-lock.yaml

@@ -39,13 +39,13 @@ importers:
         version: 11.7.12
       '@livekit/components-core':
         specifier: ^0.12.0
-        version: 0.12.15(livekit-client@2.21.0(@types/dom-mediacapture-record@1.0.22))(tslib@2.8.1)
+        version: 0.12.15(livekit-client@2.22.0(@types/dom-mediacapture-record@1.0.22))(tslib@2.8.1)
       '@livekit/components-react':
         specifier: ^2.0.0
-        version: 2.9.24(livekit-client@2.21.0(@types/dom-mediacapture-record@1.0.22))(react-dom@19.2.8(react@19.2.8))(react@19.2.8)(tslib@2.8.1)
+        version: 2.9.24(livekit-client@2.22.0(@types/dom-mediacapture-record@1.0.22))(react-dom@19.2.8(react@19.2.8))(react@19.2.8)(tslib@2.8.1)
       '@livekit/track-processors':
         specifier: ^0.7.1
-        version: 0.7.2(@types/dom-mediacapture-transform@0.1.11)(livekit-client@2.21.0(@types/dom-mediacapture-record@1.0.22))
+        version: 0.7.2(@types/dom-mediacapture-transform@0.1.11)(livekit-client@2.22.0(@types/dom-mediacapture-record@1.0.22))
       '@mediapipe/tasks-vision':
         specifier: ^0.10.18
         version: 0.10.35
@@ -66,7 +66,7 @@ importers:
         version: 10.1.2(react-dom@19.2.8(react@19.2.8))(react@19.2.8)
       '@rolldown/plugin-babel':
         specifier: ^0.2.3
-        version: 0.2.3(@babel/core@7.29.7(supports-color@7.2.0))(@babel/runtime@7.29.7)(rolldown@1.1.5)(vite@8.1.5(@types/node@24.13.3)(esbuild@0.28.1)(jiti@2.7.0)(sass@1.102.0)(terser@5.46.1)(yaml@2.9.0))
+        version: 0.2.3(@babel/core@7.29.7(supports-color@7.2.0))(@babel/runtime@8.0.0)(rolldown@1.1.5)(vite@8.1.5(@types/node@24.13.3)(esbuild@0.28.1)(jiti@2.7.0)(sass@1.102.0)(terser@5.46.1)(yaml@2.9.0))
       '@sentry/react':
         specifier: ^8.0.0
         version: 8.55.2(react@19.2.8)
@@ -132,13 +132,13 @@ importers:
         version: 10.3.1(react@19.2.8)
       '@vector-im/compound-design-tokens':
         specifier: ^10.0.0
-        version: 10.2.3(@types/react@19.2.17)(react@19.2.8)
+        version: 10.2.4(@types/react@19.2.17)(react@19.2.8)
       '@vector-im/compound-web':
         specifier: ^10.0.0
-        version: 10.0.1(@fontsource/inconsolata@5.3.0)(@fontsource/inter@5.3.0)(@types/react-dom@19.2.3(@types/react@19.2.17))(@types/react@19.2.17)(@vector-im/compound-design-tokens@10.2.3(@types/react@19.2.17)(react@19.2.8))(react-dom@19.2.8(react@19.2.8))(react@19.2.8)
+        version: 10.0.1(@fontsource/inconsolata@5.3.0)(@fontsource/inter@5.3.0)(@types/react-dom@19.2.3(@types/react@19.2.17))(@types/react@19.2.17)(@vector-im/compound-design-tokens@10.2.4(@types/react@19.2.17)(react@19.2.8))(react-dom@19.2.8(react@19.2.8))(react@19.2.8)
       '@vitejs/plugin-react':
         specifier: ^6.0.2
-        version: 6.0.5(@rolldown/plugin-babel@0.2.3(@babel/core@7.29.7(supports-color@7.2.0))(@babel/runtime@7.29.7)(rolldown@1.1.5)(vite@8.1.5(@types/node@24.13.3)(esbuild@0.28.1)(jiti@2.7.0)(sass@1.102.0)(terser@5.46.1)(yaml@2.9.0)))(babel-plugin-react-compiler@1.0.0)(vite@8.1.5(@types/node@24.13.3)(esbuild@0.28.1)(jiti@2.7.0)(sass@1.102.0)(terser@5.46.1)(yaml@2.9.0))
+        version: 6.0.5(@rolldown/plugin-babel@0.2.3(@babel/core@7.29.7(supports-color@7.2.0))(@babel/runtime@8.0.0)(rolldown@1.1.5)(vite@8.1.5(@types/node@24.13.3)(esbuild@0.28.1)(jiti@2.7.0)(sass@1.102.0)(terser@5.46.1)(yaml@2.9.0)))(babel-plugin-react-compiler@1.0.0)(vite@8.1.5(@types/node@24.13.3)(esbuild@0.28.1)(jiti@2.7.0)(sass@1.102.0)(terser@5.46.1)(yaml@2.9.0))
       '@vitest/browser-playwright':
         specifier: ^4.1.5
         version: 4.1.10(playwright@1.62.0)(vite@8.1.5(@types/node@24.13.3)(esbuild@0.28.1)(jiti@2.7.0)(sass@1.102.0)(terser@5.46.1)(yaml@2.9.0))(vitest@4.1.10)
@@ -183,7 +183,7 @@ importers:
         version: 5.88.1(@emnapi/core@1.11.2)(@emnapi/runtime@1.11.2)(@types/node@24.13.3)(typescript@5.9.3)
       livekit-client:
         specifier: ^2.18.1
-        version: 2.21.0(@types/dom-mediacapture-record@1.0.22)
+        version: 2.22.0(@types/dom-mediacapture-record@1.0.22)
       lodash-es:
         specifier: ^4.17.21
         version: 4.18.1
@@ -192,7 +192,7 @@ importers:
         version: 1.9.2
       matrix-js-sdk:
         specifier: github:matrix-org/matrix-js-sdk#develop
-        version: https://codeload.github.com/matrix-org/matrix-js-sdk/tar.gz/178dc6528ebc6a15e2f6fab38410127f16b500d0
+        version: https://codeload.github.com/matrix-org/matrix-js-sdk/tar.gz/24929be0e741be6a5d0a7226f1c682e245263b8a
       matrix-widget-api:
         specifier: ^1.18.0
         version: 1.18.0
@@ -1191,8 +1191,8 @@ packages:
       '@types/dom-mediacapture-transform': ^0.1.9
       livekit-client: ^1.12.0 || ^2.1.0
 
-  '@matrix-org/matrix-sdk-crypto-wasm@18.4.0':
-    resolution: {integrity: sha512-osxkU1DQ+05+anGHapjWyvZqdHUb94Id37gy54mCKn1Cq/D7iGT5oEUEhjp4oTnCLo4TOtI6ULJ/LHsapaIptQ==}
+  '@matrix-org/matrix-sdk-crypto-wasm@18.5.0':
+    resolution: {integrity: sha512-E826Hy1rG26LanPjtSsOiVRcVoHfSgPgj2r2Xsb5RPScpaKi9XJADQ0u3dNjRCitZPX4oyLNl1FDd5AfDlmIwQ==}
     engines: {node: '>= 18'}
 
   '@mdx-js/react@3.1.1':
@@ -3240,14 +3240,20 @@ packages:
     peerDependencies:
       react: '>= 16.8.0'
 
-  '@vector-im/compound-design-tokens@10.2.3':
-    resolution: {integrity: sha512-K2xNkjOzYn2Ya0kUqCy7JIYyx9jbkNIWpex2t9m3FUG4wzkNscvaiRJ/a9Wse1aJmwDDARcHU6mUjtHf5os5MA==}
+  '@vector-im/compound-design-tokens@10.2.4':
+    resolution: {integrity: sha512-2aCjhSvJxktPWnvh5s9Xdc0Rd76AfHqbDbN4QjOxo2VIac6zYdLyQbxMUQ5ZeoR9G3vAxILd0H1UvApRfMilpQ==}
     peerDependencies:
+      '@adobe/leonardo-contrast-colors': ^1.0.0
       '@types/react': '*'
+      chroma-js: ^3.0.0
       react: ^17 || ^18 || ^19.0.0
     peerDependenciesMeta:
+      '@adobe/leonardo-contrast-colors':
+        optional: true
       '@types/react':
         optional: true
+      chroma-js:
+        optional: true
       react:
         optional: true
 
@@ -3664,9 +3670,9 @@ packages:
   constants-browserify@1.0.0:
     resolution: {integrity: sha512-xFxOwqIzR/e1k1gLiWEophSCMqXcwVHIH7akf7b/vxcUeGunlj3hvZaaqxwHsTgn+IndtkQJgSztIDWeumWJDQ==}
 
-  content-type@2.0.0:
-    resolution: {integrity: sha512-j/O/d7GcZCyNl7/hwZAb606rzqkyvaDctLmckbxLzHvFBzTJHuGEdodATcP3yIRoDrLHkIATJuvzbFlp/ki2cQ==}
-    engines: {node: '>=18'}
+  content-type@3.0.0:
+    resolution: {integrity: sha512-AIi5H6p0xk5uknXcN3/rmhP8jgp69OfSe/JuKiQAFprJ7UGw7mwj7m4XcmDzlrnJDG+cGpphAINGdU3g3g7kDw==}
+    engines: {node: '>=22'}
 
   convert-source-map@2.0.0:
     resolution: {integrity: sha512-Kvp459HrV2FEJ1CAsi1Ku+MY3kasH19TFykTz2xWmMeq6bk2NU3XXvfJ+Q61m0xktWwt+1HSYf3JZsTms3aRJg==}
@@ -4459,8 +4465,8 @@ packages:
     resolution: {integrity: sha512-AC/7JofJvZGrrneWNaEnJeOLUx+JlGt7tNa0wZiRPT4MY1wmfKjt2+6O2p2uz2+skll8OZZmJMNqeke7kKbNgQ==}
     hasBin: true
 
-  jose@6.2.4:
-    resolution: {integrity: sha512-N8acGzVsQy6M/fjFcxtysNc4Q379TcM5dM/qKkNtsHFji88yANnXTr7BLeP75iPnFwBfQzM/jg2BZ9+HZrHCZA==}
+  jose@6.2.10:
+    resolution: {integrity: sha512-iiW7J9qRFlGxvCOIBDBDxFePQSn7ZMAnrYGhrrOo6siO/MIqwfyilLR27pkfDgUk+raLuzADS8A3S/KLBisc0g==}
 
   jose@6.2.9:
     resolution: {integrity: sha512-XrchZOFZUl/T3vTwRe8XK+cJrGtMF4th1ARnDfwbBXFKThGhlsxEE4Zu03AD/bjJSt/9jT/mxrOCkJWOg77aPA==}
@@ -4608,8 +4614,8 @@ packages:
   lines-and-columns@1.2.4:
     resolution: {integrity: sha512-7ylylesZQ/PV29jhEDl3Ufjo6ZX7gCqJr5F7PKrqc93v7fzSymt1BpwEU8nAUXs8qzzvqhbjhK5QZg6Mt/HkBg==}
 
-  livekit-client@2.21.0:
-    resolution: {integrity: sha512-RBUhPkV/sl1nzl8lokVlK5uATPwn0AlsudCBZXissw/kDl9yz8ac4pNJ43iPpMVoHOeBYH/BZ3vUC1adqa/zFQ==}
+  livekit-client@2.22.0:
+    resolution: {integrity: sha512-GLtYQfRh/RsvXaOX1x609bFZ17yyKmKWDqu9JmkMKn9vIFLi2GsapRv9gT8OJO/1R2dsitrkbGmloyUfxWQsaA==}
     peerDependencies:
       '@types/dom-mediacapture-record': ^1
 
@@ -4679,9 +4685,9 @@ packages:
   matrix-events-sdk@0.0.1:
     resolution: {integrity: sha512-1QEOsXO+bhyCroIe2/A5OwaxHvBm7EsSQ46DEDn8RBIfQwN5HWBpFvyWWR4QY0KHPPnnJdI99wgRiAl7Ad5qaA==}
 
-  matrix-js-sdk@https://codeload.github.com/matrix-org/matrix-js-sdk/tar.gz/178dc6528ebc6a15e2f6fab38410127f16b500d0:
-    resolution: {gitHosted: true, integrity: sha512-UmlkoXs9VMZvNaDeQqBb2k+gLifnIqEZc5cxrLeEwdYEDakQLbRqrFtmvIp4ipUCjdIPkCgtzb7QLlpPBLAwqA==, tarball: https://codeload.github.com/matrix-org/matrix-js-sdk/tar.gz/178dc6528ebc6a15e2f6fab38410127f16b500d0}
-    version: 42.1.0
+  matrix-js-sdk@https://codeload.github.com/matrix-org/matrix-js-sdk/tar.gz/24929be0e741be6a5d0a7226f1c682e245263b8a:
+    resolution: {gitHosted: true, integrity: sha512-0EGwbXzvG88sBOxq4ZlCRwT4VpQj2xkizfyy0A3bTSK0ysb6/gXJ/o1WPFoqCjRGMDgPq4gAsk92xGtHA7EhPg==, tarball: https://codeload.github.com/matrix-org/matrix-js-sdk/tar.gz/24929be0e741be6a5d0a7226f1c682e245263b8a}
+    version: 42.2.0
     engines: {node: '>=22.0.0'}
 
   matrix-widget-api@1.18.0:
@@ -7064,21 +7070,21 @@ snapshots:
       '@jridgewell/resolve-uri': 3.1.2
       '@jridgewell/sourcemap-codec': 1.5.5
 
-  '@livekit/components-core@0.12.15(livekit-client@2.21.0(@types/dom-mediacapture-record@1.0.22))(tslib@2.8.1)':
+  '@livekit/components-core@0.12.15(livekit-client@2.22.0(@types/dom-mediacapture-record@1.0.22))(tslib@2.8.1)':
     dependencies:
       '@floating-ui/dom': 1.7.6
-      livekit-client: 2.21.0(@types/dom-mediacapture-record@1.0.22)
+      livekit-client: 2.22.0(@types/dom-mediacapture-record@1.0.22)
       loglevel: 1.9.1
       rxjs: 7.8.2
       tslib: 2.8.1
 
-  '@livekit/components-react@2.9.24(livekit-client@2.21.0(@types/dom-mediacapture-record@1.0.22))(react-dom@19.2.8(react@19.2.8))(react@19.2.8)(tslib@2.8.1)':
+  '@livekit/components-react@2.9.24(livekit-client@2.22.0(@types/dom-mediacapture-record@1.0.22))(react-dom@19.2.8(react@19.2.8))(react@19.2.8)(tslib@2.8.1)':
     dependencies:
-      '@livekit/components-core': 0.12.15(livekit-client@2.21.0(@types/dom-mediacapture-record@1.0.22))(tslib@2.8.1)
+      '@livekit/components-core': 0.12.15(livekit-client@2.22.0(@types/dom-mediacapture-record@1.0.22))(tslib@2.8.1)
       clsx: 2.1.1
       events: 3.3.0
       jose: 6.2.9
-      livekit-client: 2.21.0(@types/dom-mediacapture-record@1.0.22)
+      livekit-client: 2.22.0(@types/dom-mediacapture-record@1.0.22)
       react: 19.2.8
       react-dom: 19.2.8(react@19.2.8)
       tslib: 2.8.1
@@ -7090,13 +7096,13 @@ snapshots:
     dependencies:
       '@bufbuild/protobuf': 1.10.1
 
-  '@livekit/track-processors@0.7.2(@types/dom-mediacapture-transform@0.1.11)(livekit-client@2.21.0(@types/dom-mediacapture-record@1.0.22))':
+  '@livekit/track-processors@0.7.2(@types/dom-mediacapture-transform@0.1.11)(livekit-client@2.22.0(@types/dom-mediacapture-record@1.0.22))':
     dependencies:
       '@mediapipe/tasks-vision': 0.10.35
       '@types/dom-mediacapture-transform': 0.1.11
-      livekit-client: 2.21.0(@types/dom-mediacapture-record@1.0.22)
+      livekit-client: 2.22.0(@types/dom-mediacapture-record@1.0.22)
 
-  '@matrix-org/matrix-sdk-crypto-wasm@18.4.0': {}
+  '@matrix-org/matrix-sdk-crypto-wasm@18.5.0': {}
 
   '@mdx-js/react@3.1.1(@types/react@19.2.17)(react@19.2.8)':
     dependencies:
@@ -8047,13 +8053,13 @@ snapshots:
   '@rolldown/binding-win32-x64-msvc@1.1.5':
     optional: true
 
-  '@rolldown/plugin-babel@0.2.3(@babel/core@7.29.7(supports-color@7.2.0))(@babel/runtime@7.29.7)(rolldown@1.1.5)(vite@8.1.5(@types/node@24.13.3)(esbuild@0.28.1)(jiti@2.7.0)(sass@1.102.0)(terser@5.46.1)(yaml@2.9.0))':
+  '@rolldown/plugin-babel@0.2.3(@babel/core@7.29.7(supports-color@7.2.0))(@babel/runtime@8.0.0)(rolldown@1.1.5)(vite@8.1.5(@types/node@24.13.3)(esbuild@0.28.1)(jiti@2.7.0)(sass@1.102.0)(terser@5.46.1)(yaml@2.9.0))':
     dependencies:
       '@babel/core': 7.29.7(supports-color@7.2.0)
       picomatch: 4.0.4
       rolldown: 1.1.5
     optionalDependencies:
-      '@babel/runtime': 7.29.7
+      '@babel/runtime': 8.0.0
       vite: 8.1.5(@types/node@24.13.3)(esbuild@0.28.1)(jiti@2.7.0)(sass@1.102.0)(terser@5.46.1)(yaml@2.9.0)
 
   '@rolldown/pluginutils@1.0.1': {}
@@ -8711,12 +8717,12 @@ snapshots:
       '@use-gesture/core': 10.3.1
       react: 19.2.8
 
-  '@vector-im/compound-design-tokens@10.2.3(@types/react@19.2.17)(react@19.2.8)':
+  '@vector-im/compound-design-tokens@10.2.4(@types/react@19.2.17)(react@19.2.8)':
     optionalDependencies:
       '@types/react': 19.2.17
       react: 19.2.8
 
-  '@vector-im/compound-web@10.0.1(@fontsource/inconsolata@5.3.0)(@fontsource/inter@5.3.0)(@types/react-dom@19.2.3(@types/react@19.2.17))(@types/react@19.2.17)(@vector-im/compound-design-tokens@10.2.3(@types/react@19.2.17)(react@19.2.8))(react-dom@19.2.8(react@19.2.8))(react@19.2.8)':
+  '@vector-im/compound-web@10.0.1(@fontsource/inconsolata@5.3.0)(@fontsource/inter@5.3.0)(@types/react-dom@19.2.3(@types/react@19.2.17))(@types/react@19.2.17)(@vector-im/compound-design-tokens@10.2.4(@types/react@19.2.17)(react@19.2.8))(react-dom@19.2.8(react@19.2.8))(react@19.2.8)':
     dependencies:
       '@floating-ui/react': 0.27.20(react-dom@19.2.8(react@19.2.8))(react@19.2.8)
       '@floating-ui/react-dom': 2.1.9(react-dom@19.2.8(react@19.2.8))(react@19.2.8)
@@ -8728,7 +8734,7 @@ snapshots:
       '@radix-ui/react-progress': 1.1.16(@types/react-dom@19.2.3(@types/react@19.2.17))(@types/react@19.2.17)(react-dom@19.2.8(react@19.2.8))(react@19.2.8)
       '@radix-ui/react-separator': 1.1.15(@types/react-dom@19.2.3(@types/react@19.2.17))(@types/react@19.2.17)(react-dom@19.2.8(react@19.2.8))(react@19.2.8)
       '@radix-ui/react-slot': 1.3.3(@types/react@19.2.17)(react@19.2.8)
-      '@vector-im/compound-design-tokens': 10.2.3(@types/react@19.2.17)(react@19.2.8)
+      '@vector-im/compound-design-tokens': 10.2.4(@types/react@19.2.17)(react@19.2.8)
       classnames: 2.5.1
       react: 19.2.8
       vaul: 1.1.2(@types/react-dom@19.2.3(@types/react@19.2.17))(@types/react@19.2.17)(react-dom@19.2.8(react@19.2.8))(react@19.2.8)
@@ -8738,12 +8744,12 @@ snapshots:
       - '@types/react-dom'
       - react-dom
 
-  '@vitejs/plugin-react@6.0.5(@rolldown/plugin-babel@0.2.3(@babel/core@7.29.7(supports-color@7.2.0))(@babel/runtime@7.29.7)(rolldown@1.1.5)(vite@8.1.5(@types/node@24.13.3)(esbuild@0.28.1)(jiti@2.7.0)(sass@1.102.0)(terser@5.46.1)(yaml@2.9.0)))(babel-plugin-react-compiler@1.0.0)(vite@8.1.5(@types/node@24.13.3)(esbuild@0.28.1)(jiti@2.7.0)(sass@1.102.0)(terser@5.46.1)(yaml@2.9.0))':
+  '@vitejs/plugin-react@6.0.5(@rolldown/plugin-babel@0.2.3(@babel/core@7.29.7(supports-color@7.2.0))(@babel/runtime@8.0.0)(rolldown@1.1.5)(vite@8.1.5(@types/node@24.13.3)(esbuild@0.28.1)(jiti@2.7.0)(sass@1.102.0)(terser@5.46.1)(yaml@2.9.0)))(babel-plugin-react-compiler@1.0.0)(vite@8.1.5(@types/node@24.13.3)(esbuild@0.28.1)(jiti@2.7.0)(sass@1.102.0)(terser@5.46.1)(yaml@2.9.0))':
     dependencies:
       '@rolldown/pluginutils': 1.0.1
       vite: 8.1.5(@types/node@24.13.3)(esbuild@0.28.1)(jiti@2.7.0)(sass@1.102.0)(terser@5.46.1)(yaml@2.9.0)
     optionalDependencies:
-      '@rolldown/plugin-babel': 0.2.3(@babel/core@7.29.7(supports-color@7.2.0))(@babel/runtime@7.29.7)(rolldown@1.1.5)(vite@8.1.5(@types/node@24.13.3)(esbuild@0.28.1)(jiti@2.7.0)(sass@1.102.0)(terser@5.46.1)(yaml@2.9.0))
+      '@rolldown/plugin-babel': 0.2.3(@babel/core@7.29.7(supports-color@7.2.0))(@babel/runtime@8.0.0)(rolldown@1.1.5)(vite@8.1.5(@types/node@24.13.3)(esbuild@0.28.1)(jiti@2.7.0)(sass@1.102.0)(terser@5.46.1)(yaml@2.9.0))
       babel-plugin-react-compiler: 1.0.0
 
   '@vitest/browser-playwright@4.1.10(playwright@1.62.0)(vite@8.1.5(@types/node@24.13.3)(esbuild@0.28.1)(jiti@2.7.0)(sass@1.102.0)(terser@5.46.1)(yaml@2.9.0))(vitest@4.1.10)':
@@ -9189,7 +9195,7 @@ snapshots:
 
   constants-browserify@1.0.0: {}
 
-  content-type@2.0.0: {}
+  content-type@3.0.0: {}
 
   convert-source-map@2.0.0: {}
 
@@ -10053,7 +10059,7 @@ snapshots:
 
   jiti@2.7.0: {}
 
-  jose@6.2.4: {}
+  jose@6.2.10: {}
 
   jose@6.2.9: {}
 
@@ -10197,13 +10203,13 @@ snapshots:
 
   lines-and-columns@1.2.4: {}
 
-  livekit-client@2.21.0(@types/dom-mediacapture-record@1.0.22):
+  livekit-client@2.22.0(@types/dom-mediacapture-record@1.0.22):
     dependencies:
       '@livekit/mutex': 1.1.1
       '@livekit/protocol': 1.50.4
       '@types/dom-mediacapture-record': 1.0.22
       events: 3.3.0
-      jose: 6.2.4
+      jose: 6.2.10
       loglevel: 1.9.2
       sdp-transform: 2.15.0
       tslib: 2.8.1
@@ -10269,13 +10275,13 @@ snapshots:
 
   matrix-events-sdk@0.0.1: {}
 
-  matrix-js-sdk@https://codeload.github.com/matrix-org/matrix-js-sdk/tar.gz/178dc6528ebc6a15e2f6fab38410127f16b500d0:
+  matrix-js-sdk@https://codeload.github.com/matrix-org/matrix-js-sdk/tar.gz/24929be0e741be6a5d0a7226f1c682e245263b8a:
     dependencies:
       '@babel/runtime': 8.0.0
-      '@matrix-org/matrix-sdk-crypto-wasm': 18.4.0
+      '@matrix-org/matrix-sdk-crypto-wasm': 18.5.0
       another-json: 0.2.0
       bs58: 6.0.0
-      content-type: 2.0.0
+      content-type: 3.0.0
       loglevel: 1.9.2
       matrix-events-sdk: 0.0.1
       matrix-widget-api: 1.18.0

src/components/CallFooter.stories.tsx

@@ -127,6 +127,7 @@ export const Default: Story = {
     showFooter: true,
     hideControls: false,
     asOverlay: false,
+    showModals: true,
     sharingScreen: false,
     audioOutputSwitcher: undefined,
     reactionIdentifier: undefined,

src/components/CallFooter.tsx

@@ -26,6 +26,7 @@ import {
   MediaMuteAndSwitchButton,
   type MenuOptions,
 } from "./MediaMuteAndSwitchButton";
+import { type Behavior } from "../state/Behavior";
 import { type ViewModel } from "../state/ViewModel";
 import { useBehavior } from "../useBehavior";
 import { type LayoutSwitchViewModel } from "../state/LayoutSwitchViewModel";
@@ -76,6 +77,7 @@ export interface FooterState {
   /** The footer should be used as an overlay.
    * (Over the Call Grid) This saves spaces on small screens. */
   asOverlay: boolean;
+  showModals: boolean;
 
   buttonSize: "md" | "lg";
   showLogo: boolean;
@@ -120,6 +122,7 @@ export const CallFooter: FC<FooterProps> = ({
   const asOverlay = useBehavior(vm.asOverlay$);
   const showFooter = useBehavior(vm.showFooter$);
   const hideControls = useBehavior(vm.hideControls$);
+  const showModals = useBehavior(vm.showModals$);
   const layoutSwitchVm = useBehavior(vm.layoutSwitchVm$);
   const openSettings = useBehavior(vm.openSettings$);
   const audioEnabled = useBehavior(vm.audioEnabled$);
@@ -135,7 +138,6 @@ export const CallFooter: FC<FooterProps> = ({
   const audioOutputSwitcher = useBehavior(vm.audioOutputSwitcher$);
   const hangup = useBehavior(vm.hangup$);
   const debugTileLayout = useBehavior(vm.debugTileLayout$);
-  const tileStoreGeneration = useBehavior(vm.tileStoreGeneration$);
   const videoOptions = useBehavior(vm.videoOptions$);
   const selectedVideo = useBehavior(vm.selectedVideo$);
   const audioOptions = useBehavior(vm.audioOptions$);
@@ -235,7 +237,8 @@ export const CallFooter: FC<FooterProps> = ({
     );
   }
 
-  if (reactionIdentifier && reactionData) {
+  // Reaction button contains a pretty large menu, so treat it like a modal
+  if (reactionIdentifier && reactionData && showModals) {
     buttons.push(
       <ReactionToggleButton
         size={buttonSize}
@@ -283,7 +286,9 @@ export const CallFooter: FC<FooterProps> = ({
           />
         </>
       )}
-      {debugTileLayout ? `Tiles generation: ${tileStoreGeneration}` : undefined}
+      {debugTileLayout ? (
+        <TilesDebugInfo generation$={vm.tileStoreGeneration$} />
+      ) : undefined}
     </div>
   );
 
@@ -316,3 +321,14 @@ export const CallFooter: FC<FooterProps> = ({
     </div>
   );
 };
+
+interface TilesDebugInfoProps {
+  generation$: Behavior<number | undefined>;
+}
+
+// Isolated in its own component since the layout generation updates frequently
+// and we can avoid re-rendering the footer this way
+const TilesDebugInfo: FC<TilesDebugInfoProps> = ({ generation$ }) => {
+  const generation = useBehavior(generation$);
+  return `Tiles generation: ${generation}`;
+};

src/components/CallFooterViewModel.test.ts

@@ -49,6 +49,7 @@ function buildMinimalCallViewModel(layout: Layout): CallViewModel {
     reactions$: constant({}),
     tileStoreGeneration$: constant(0),
     showFooter$: constant(true),
+    showModals$: constant(true),
     settingsOpen$: constant(false),
     setSettingsOpen$: constant(() => {}),
   } as unknown as CallViewModel;

src/components/CallFooterViewModel.tsx

@@ -161,6 +161,7 @@ export function createCallFooterViewModel(
     // candidat to move into the FooterViewModel
     showFooter$: callModel.showFooter$,
     hideControls$: constant(!showControls),
+    showModals$: callModel.showModals$,
     asOverlay$: callModel.edgeToEdge$,
     buttonSize$: scope.behavior(
       isPip$.pipe(map<boolean, "md" | "lg">((pip) => (pip ? "md" : "lg"))),
@@ -168,12 +169,12 @@ export function createCallFooterViewModel(
 
     openSettings$: scope.behavior(
       combineLatest([
-        isPip$,
+        callModel.showModals$,
         callModel.showHeader$,
         callModel.setSettingsOpen$,
       ]).pipe(
-        map(([isPip, showHeader, setSettingsOpen]) =>
-          !isPip && headerStyle !== HeaderStyle.AppBar && showControls
+        map(([showModals, showHeader, setSettingsOpen]) =>
+          showModals && headerStyle !== HeaderStyle.AppBar && showControls
             ? (): void => setSettingsOpen(true)
             : undefined,
         ),
@@ -239,6 +240,7 @@ export function createLobbyFooterViewModel(
       showLogo,
       hideControls: false,
       asOverlay: false,
+      showModals: true,
       buttonSize: "lg",
       openSettings,
       hangup,

src/config/ConfigOptions.ts

@@ -12,9 +12,7 @@ Please see LICENSE in the repository root for full details.
  * Settings, or pinned for a deployment via `matrix_rtc_mode` in config.json.
  */
 export enum MatrixRTCMode {
-  /** Legacy single-SFU + user-keyed memberships + legacy JWT endpoint. */
-  Legacy = "legacy",
-  /** Multi-SFU transport, legacy JWT endpoint, no sticky events. */
+  /** Multi-SFU transport, legacy JWT endpoint, state events. */
   Compatibility = "compatibility",
   /**
    * Multi-SFU transport with:
@@ -86,15 +84,6 @@ export interface ConfigOptions {
      * Allow to join group calls without audio and video.
      */
     feature_group_calls_without_video_and_audio?: boolean;
-
-    /**
-     * Send device-specific call session membership state events instead of
-     * legacy user-specific call membership state events.
-     * This setting has no effect when the user joins an active call with
-     * legacy state events. For compatibility, Element Call will always join
-     * active legacy calls with legacy state events.
-     */
-    feature_use_device_session_member_events?: boolean;
   };
 
   /**
@@ -179,7 +168,8 @@ export interface ConfigOptions {
   /**
    * Pins the {@link MatrixRTCMode} for all clients on this deployment,
    * overriding any per-user choice from the Developer Settings. If unset,
-   * the user's Developer Settings choice (or its default of `Legacy`) wins.
+   * the user's Developer Settings choice (or its default of `Compatibility`)
+   * wins.
    */
   matrix_rtc_mode?: MatrixRTCMode;
 
@@ -229,6 +219,18 @@ export interface ConfigOptions {
      * This is what goes into the m.rtc.member event expiry field and is typically set to a number of hours.
      */
     membership_event_expiry_ms?: number;
+
+    /**
+     * The number of participants in the session at which the media encryption key will no longer
+     * be rotated.
+     *
+     * Rotating a key requires sending it to every participant device, so in large sessions the
+     * cost of rotating on every join/leave becomes prohibitive. At this limit the current key is
+     * kept and distributed to new joiners; no new keys are generated for joiners/leavers.
+     *
+     * Defaults to the js-sdk default (undefined). Which means that rotation will always happen.
+     */
+    key_rotation_participant_limit?: number;
   };
 }
 
@@ -262,13 +264,11 @@ export interface ResolvedConfigOptions extends ConfigOptions {
     delayed_leave_event_restart_ms?: number;
     network_error_retry_ms: number;
     membership_event_expiry_ms?: number;
+    key_rotation_participant_limit?: number;
   };
 }
 
 export const DEFAULT_CONFIG: ResolvedConfigOptions = {
-  features: {
-    feature_use_device_session_member_events: true,
-  },
   sync_disconnect_grace_period_ms: 10000,
   ssla: "https://static.element.io/legal/element-software-and-services-license-agreement-uk-1.pdf",
   media_quality: {

src/graphics/desktop-gradient.svg

@@ -1,16 +0,0 @@
-<svg width="1440" height="800" viewBox="0 0 1440 800" fill="none" xmlns="http://www.w3.org/2000/svg">
-<g filter="url(#filter0_f_4162_80259)">
-<path d="M-37.0486 666.028C267.76 138.867 944.304 -46.1945 1477.05 260.929" stroke="url(#paint0_linear_4162_80259)" stroke-width="192" stroke-linecap="round"/>
-</g>
-<defs>
-<filter id="filter0_f_4162_80259" x="-333.118" y="-183.694" width="2106.24" height="1145.68" filterUnits="userSpaceOnUse" color-interpolation-filters="sRGB">
-<feFlood flood-opacity="0" result="BackgroundImageFix"/>
-<feBlend mode="normal" in="SourceGraphic" in2="BackgroundImageFix" result="shape"/>
-<feGaussianBlur stdDeviation="100" result="effect1_foregroundBlur_4162_80259"/>
-</filter>
-<linearGradient id="paint0_linear_4162_80259" x1="1255.31" y1="320.254" x2="184.899" y2="607.497" gradientUnits="userSpaceOnUse">
-<stop stop-color="#00C59E"/>
-<stop offset="0.75" stop-color="#0044A5"/>
-</linearGradient>
-</defs>
-</svg>

src/graphics/mobile-gradient.svg

@@ -1,86 +0,0 @@
-<?xml version="1.0" encoding="UTF-8" standalone="no"?>
-<svg
-   width="1200"
-   height="285"
-   viewBox="0 0 1200 285"
-   fill="none"
-   version="1.1"
-   id="svg5"
-   xmlns="http://www.w3.org/2000/svg"
-   xmlns:svg="http://www.w3.org/2000/svg">
-  <g
-     filter="url(#filter0_f_3970_9366)"
-     id="g2"
-     transform="translate(422.00201)">
-    <path
-       d="m -164.342,495.134 c 188.2881,-188.288 494.684,-190 684.684,0"
-       stroke="url(#paint0_linear_3970_9366)"
-       stroke-width="235.517"
-       stroke-linecap="round"
-       id="path1"
-       style="stroke:url(#paint0_linear_3970_9366)" />
-    <path
-       d="m -164.342,495.134 c 188.2881,-188.288 494.684,-190 684.684,0"
-       stroke="url(#paint1_linear_3970_9366)"
-       style="mix-blend-mode:overlay;stroke:url(#paint1_linear_3970_9366)"
-       stroke-width="235.517"
-       stroke-linecap="round"
-       id="path2" />
-  </g>
-  <defs
-     id="defs5">
-    <filter
-       id="filter0_f_3970_9366"
-       x="-517.617"
-       y="-0.00012207"
-       width="1391.23"
-       height="848.409"
-       filterUnits="userSpaceOnUse"
-       color-interpolation-filters="sRGB">
-      <feFlood
-         flood-opacity="0"
-         result="BackgroundImageFix"
-         id="feFlood2" />
-      <feBlend
-         mode="normal"
-         in="SourceGraphic"
-         in2="BackgroundImageFix"
-         result="shape"
-         id="feBlend2" />
-      <feGaussianBlur
-         stdDeviation="117.758"
-         result="effect1_foregroundBlur_3970_9366"
-         id="feGaussianBlur2" />
-    </filter>
-    <linearGradient
-       id="paint0_linear_3970_9366"
-       x1="349.17099"
-       y1="323.96301"
-       x2="6.82898"
-       y2="666.30499"
-       gradientUnits="userSpaceOnUse">
-      <stop
-         stop-color="#0D5CBD"
-         id="stop2" />
-      <stop
-         offset="0.730863"
-         stop-color="#0DBDA8"
-         id="stop3" />
-    </linearGradient>
-    <linearGradient
-       id="paint1_linear_3970_9366"
-       x1="349.17099"
-       y1="323.96301"
-       x2="6.82898"
-       y2="666.30499"
-       gradientUnits="userSpaceOnUse">
-      <stop
-         stop-color="#0D5CBD"
-         id="stop4" />
-      <stop
-         offset="0.730863"
-         stop-color="#0DBDA8"
-         id="stop5" />
-    </linearGradient>
-  </defs>
-</svg>

src/index.css

@@ -78,16 +78,19 @@ body {
   body[data-background="gradient"]::before {
     content: "";
     position: fixed;
-    inset: 0;
-    background-image: url("graphics/mobile-gradient.svg");
-    background-size: auto;
+    /* Chromium abruptly fades our images to fully transparent at the edge of
+    the element. If we just make the element a little bigger than the viewport,
+    this is no longer visible. */
+    inset: -20px;
+    background-image: url("graphics/mobile-gradient.png");
+    background-size: 1400px 305px;
     background-position: bottom;
     background-repeat: no-repeat;
   }
 
   body[data-background="gradient"][data-platform="desktop"]::before {
-    background-image: url("graphics/desktop-gradient.svg");
-    background-size: calc(max(1440px, 100vw)) calc(max(800px, 100vh));
+    background-image: url("graphics/desktop-gradient.png");
+    background-size: max(1440px, 100vw) max(1440px, 100vh);
     background-position: center;
   }
 }

src/room/InCallView.test.tsx

@@ -22,7 +22,7 @@ import { TooltipProvider } from "@vector-im/compound-web";
 import { RoomContext, useLocalParticipant } from "@livekit/components-react";
 import userEvent from "@testing-library/user-event";
 
-import { InCallView } from "./InCallView";
+import { ActiveCall, InCallView } from "./InCallView";
 import {
   mockLivekitRoom,
   mockLocalParticipant,
@@ -33,7 +33,10 @@ import {
   type MockRTCSession,
 } from "../utils/test";
 import { E2eeType } from "../e2ee/e2eeType";
-import { getBasicCallViewModelEnvironment } from "../utils/test-viewmodel";
+import {
+  getBasicCallViewModelEnvironment,
+  getBasicRTCSession,
+} from "../utils/test-viewmodel";
 import {
   type CallViewModel,
   type CallViewModelOptions,
@@ -45,6 +48,8 @@ import { LivekitRoomAudioRenderer } from "../livekit/MatrixAudioRenderer";
 import { MediaDevicesContext } from "../MediaDevicesContext";
 import { type MediaDevices as ECMediaDevices } from "../state/MediaDevices";
 import { AppBar } from "../AppBar";
+import { type MatrixInfo } from "./VideoPreview";
+import { ProcessorProvider } from "../livekit/TrackProcessorContext";
 import { initializeWidget } from "../widget";
 
 initializeWidget();
@@ -78,6 +83,17 @@ const remoteParticipant = mockRemoteParticipant({
   identity: "@alice:example.org:AAAAAA",
 });
 
+const matrixInfo = {
+  userId: "",
+  displayName: "",
+  avatarUrl: "",
+  roomId: "",
+  roomName: "",
+  roomAlias: null,
+  roomAvatar: null,
+  e2eeSystem: { kind: E2eeType.NONE },
+} satisfies MatrixInfo;
+
 let useRoomEncryptionSystemMock: MockedFunction<typeof useRoomEncryptionSystem>;
 
 beforeEach(() => {
@@ -122,12 +138,13 @@ function createInCallView(args: CreateInCallViewArgs = {}): RenderResult & {
       remoteParticipants$: of([remoteParticipant]),
     },
   );
-  const { vm, footerVm, rtcSession } = getBasicCallViewModelEnvironment(
-    [local, alice],
-    undefined,
-    mediaDevices,
-    args.callViewModelOptions,
-  );
+  const { vm, footerVm, developerSettingsVm, rtcSession } =
+    getBasicCallViewModelEnvironment(
+      [local, alice],
+      undefined,
+      mediaDevices,
+      args.callViewModelOptions,
+    );
 
   rtcSession.joined = true;
   const room = rtcSession.room;
@@ -140,18 +157,8 @@ function createInCallView(args: CreateInCallViewArgs = {}): RenderResult & {
       muteStates={muteState}
       vm={vm}
       footerVm={footerVm}
-      matrixInfo={{
-        userId: "",
-        displayName: "",
-        avatarUrl: "",
-        roomId: "",
-        roomName: "",
-        roomAlias: null,
-        roomAvatar: null,
-        e2eeSystem: {
-          kind: E2eeType.NONE,
-        },
-      }}
+      developerSettingsVm={developerSettingsVm}
+      matrixInfo={matrixInfo}
       matrixRoom={room}
       onShareClick={null}
     />
@@ -226,3 +233,34 @@ describe("InCallView", () => {
     });
   });
 });
+
+describe("ActiveCall", () => {
+  it("creates the view models and renders the call", async () => {
+    const mediaDevices = mockMediaDevices({});
+    const { rtcSession, matrixRoom } = getBasicRTCSession([local, alice]);
+    const { findByTestId } = render(
+      <BrowserRouter>
+        <MediaDevicesContext value={mediaDevices}>
+          <ProcessorProvider>
+            <TooltipProvider>
+              <RoomContext value={mockLivekitRoom({ localParticipant })}>
+                <ActiveCall
+                  client={matrixRoom.client}
+                  rtcSession={rtcSession.asMockedSession()}
+                  matrixRoom={matrixRoom}
+                  muteStates={mockMuteStates()}
+                  matrixInfo={matrixInfo}
+                  onShareClick={null}
+                  e2eeSystem={{ kind: E2eeType.NONE }}
+                  onLeft={(): void => {}}
+                />
+              </RoomContext>
+            </TooltipProvider>
+          </ProcessorProvider>
+        </MediaDevicesContext>
+      </BrowserRouter>,
+    );
+    // Rendering at all proves ActiveCall created all of its view models
+    expect(await findByTestId("incall_leave")).toBeVisible();
+  });
+});

src/room/InCallView.tsx

@@ -83,6 +83,8 @@ import { ObservableScope } from "../state/ObservableScope.ts";
 import { CallFooter, type FooterSnapshot } from "../components/CallFooter.tsx";
 import { SettingsIconButton } from "../button/Button.tsx";
 import { createCallFooterViewModel } from "../components/CallFooterViewModel.tsx";
+import { createDeveloperSettingsTabViewModel } from "../settings/DeveloperSettingsTabViewModel.ts";
+import { type DeveloperSettingsSnapshot } from "../settings/DeveloperSettingsTab.tsx";
 import { type ViewModel } from "../state/ViewModel.ts";
 import { RingingStatus } from "../tile/RingingStatus.tsx";
 import { RingingAudioRenderer } from "./RingingAudioRenderer.tsx";
@@ -96,7 +98,7 @@ declare module "react" {
 
 export interface ActiveCallProps extends Omit<
   InCallViewProps,
-  "vm" | "livekitRoom" | "connState" | "footerVm"
+  "vm" | "livekitRoom" | "connState" | "footerVm" | "developerSettingsVm"
 > {
   e2eeSystem: EncryptionSystem;
   // TODO refactor those reasons into an enum
@@ -110,6 +112,9 @@ export const ActiveCall: FC<ActiveCallProps> = (props) => {
   const [footerVm, setFooterVm] = useState<ViewModel<FooterSnapshot> | null>(
     null,
   );
+  const [developerSettingsVm, setDeveloperSettingsVm] =
+    useState<ViewModel<DeveloperSettingsSnapshot> | null>(null);
+
   const urlParams = useUrlParams();
   const mediaDevices = useMediaDevices();
   const trackProcessorState$ = useTrackProcessorObservable$();
@@ -169,6 +174,7 @@ export const ActiveCall: FC<ActiveCallProps> = (props) => {
       `${props.client.getUserId()}:${props.client.getDeviceId()}`,
     );
     setFooterVm(footerVm);
+    setDeveloperSettingsVm(createDeveloperSettingsTabViewModel(scope, vm));
 
     return (): void => {
       scope.end();
@@ -188,10 +194,16 @@ export const ActiveCall: FC<ActiveCallProps> = (props) => {
 
   if (vm === null) return null;
   if (footerVm === null) return null;
+  if (developerSettingsVm === null) return null;
 
   return (
     <ReactionsSenderProvider vm={vm} rtcSession={props.rtcSession}>
-      <InCallView {...props} vm={vm} footerVm={footerVm} />
+      <InCallView
+        {...props}
+        vm={vm}
+        footerVm={footerVm}
+        developerSettingsVm={developerSettingsVm}
+      />
     </ReactionsSenderProvider>
   );
 };
@@ -200,6 +212,7 @@ export interface InCallViewProps {
   client: MatrixClient;
   vm: CallViewModel;
   footerVm: ViewModel<FooterSnapshot>;
+  developerSettingsVm: ViewModel<DeveloperSettingsSnapshot>;
   matrixInfo: MatrixInfo;
   rtcSession: MatrixRTCSession;
   matrixRoom: MatrixRoom;
@@ -211,6 +224,7 @@ export const InCallView: FC<InCallViewProps> = ({
   client,
   vm,
   footerVm,
+  developerSettingsVm,
   matrixInfo,
   matrixRoom,
   muteStates,
@@ -261,6 +275,7 @@ export const InCallView: FC<InCallViewProps> = ({
   const overflowing = useBehavior(vm.overflowing$);
   const showNameTags = useBehavior(vm.showNameTags$);
   const showHeader = useBehavior(vm.showHeader$);
+  const showModals = useBehavior(vm.showModals$);
   const settingsOpen = useBehavior(vm.settingsOpen$);
   const setSettingsOpen = useBehavior(vm.setSettingsOpen$);
   const earpieceMode = useBehavior(vm.earpieceMode$);
@@ -622,7 +637,7 @@ export const InCallView: FC<InCallViewProps> = ({
       {earpieceOverlay}
       <ReactionsOverlay vm={vm} />
       {footer}
-      {layout.type !== "pip" && (
+      {showModals && (
         <>
           <RageshakeRequestModal {...rageshakeRequestModalProps} />
           <SettingsModal
@@ -632,6 +647,7 @@ export const InCallView: FC<InCallViewProps> = ({
             onDismiss={(): void => setSettingsOpen(false)}
             tab={settingsTab}
             onTabChange={setSettingsTab}
+            developerSettingsVm={developerSettingsVm}
             livekitRooms={allConnections
               .getConnections()
               .map((connectionItem) => ({

src/room/VideoPreview.module.css

@@ -22,6 +22,9 @@ Please see LICENSE in the repository root for full details.
   height: 100%;
   object-fit: cover;
   background-color: var(--video-tile-background);
+  /* In FF if you add a transform: scale/translate/matrix filter on an element,
+  it'll ignore the parents' border-radius, so force back the radius to avoid UI glitch*/
+  border-radius: inherit;
 }
 
 video.mirror {

src/settings/DeveloperSettingsTab.test.tsx

@@ -12,7 +12,12 @@ import { TooltipProvider } from "@vector-im/compound-web";
 
 import type { MatrixClient } from "matrix-js-sdk";
 import type { Room as LivekitRoom } from "livekit-client";
-import { DeveloperSettingsTab } from "./DeveloperSettingsTab";
+import {
+  DeveloperSettingsTab,
+  type DeveloperSettingsSnapshot,
+} from "./DeveloperSettingsTab";
+import { outOfCallDeveloperSettingsTabViewModel } from "./DeveloperSettingsTabViewModel";
+import { createStaticViewModel } from "../state/ViewModel";
 import { getSFUConfigWithOpenID } from "../livekit/openIDSFU";
 import {
   customLivekitUrl as customLivekitUrlSetting,
@@ -107,6 +112,7 @@ describe("DeveloperSettingsTab", () => {
         roomId={"#room:example.org"}
         livekitRooms={livekitRooms}
         env={{ MY_MOCK_ENV: 10, ENV: "test" } as unknown as ImportMetaEnv}
+        vm={outOfCallDeveloperSettingsTabViewModel}
       />,
     );
 
@@ -136,6 +142,7 @@ describe("DeveloperSettingsTab", () => {
           <DeveloperSettingsTab
             client={client}
             env={{} as unknown as ImportMetaEnv}
+            vm={outOfCallDeveloperSettingsTabViewModel}
           />
         </TooltipProvider>,
       );
@@ -159,6 +166,7 @@ describe("DeveloperSettingsTab", () => {
             client={client}
             roomId="#testRoom"
             env={{} as unknown as ImportMetaEnv}
+            vm={outOfCallDeveloperSettingsTabViewModel}
           />
         </TooltipProvider>,
       );
@@ -181,6 +189,7 @@ describe("DeveloperSettingsTab", () => {
             client={client}
             roomId="#testRoom"
             env={{} as unknown as ImportMetaEnv}
+            vm={outOfCallDeveloperSettingsTabViewModel}
           />
         </TooltipProvider>,
       );
@@ -206,6 +215,7 @@ describe("DeveloperSettingsTab", () => {
             client={client}
             roomId="#testRoom"
             env={{} as unknown as ImportMetaEnv}
+            vm={outOfCallDeveloperSettingsTabViewModel}
           />
         </TooltipProvider>,
       );
@@ -236,6 +246,7 @@ describe("DeveloperSettingsTab", () => {
             client={client}
             roomId="#testRoom"
             env={{} as unknown as ImportMetaEnv}
+            vm={outOfCallDeveloperSettingsTabViewModel}
           />
         </TooltipProvider>,
       );
@@ -273,6 +284,7 @@ describe("DeveloperSettingsTab", () => {
           <DeveloperSettingsTab
             client={client}
             env={{} as unknown as ImportMetaEnv}
+            vm={outOfCallDeveloperSettingsTabViewModel}
           />
         </TooltipProvider>,
       );
@@ -305,6 +317,7 @@ describe("DeveloperSettingsTab", () => {
           <DeveloperSettingsTab
             client={client}
             env={{} as unknown as ImportMetaEnv}
+            vm={outOfCallDeveloperSettingsTabViewModel}
           />
         </TooltipProvider>,
       );
@@ -317,19 +330,15 @@ describe("DeveloperSettingsTab", () => {
 
   describe("matrix rtc mode", () => {
     afterEach(() => {
-      matrixRTCModeSetting.setValue(MatrixRTCMode.Legacy);
+      matrixRTCModeSetting.setValue(MatrixRTCMode.Compatibility);
       vi.restoreAllMocks();
     });
 
     function getModeRadios(): {
-      legacy: HTMLInputElement;
       compatibility: HTMLInputElement;
       matrix20: HTMLInputElement;
     } {
       return {
-        legacy: screen.getByDisplayValue(
-          MatrixRTCMode.Legacy,
-        ) as HTMLInputElement,
         compatibility: screen.getByDisplayValue(
           MatrixRTCMode.Compatibility,
         ) as HTMLInputElement,
@@ -349,6 +358,7 @@ describe("DeveloperSettingsTab", () => {
           <DeveloperSettingsTab
             client={client}
             env={{} as unknown as ImportMetaEnv}
+            vm={outOfCallDeveloperSettingsTabViewModel}
           />
         </TooltipProvider>,
       );
@@ -359,27 +369,21 @@ describe("DeveloperSettingsTab", () => {
 
       const radios = getModeRadios();
       expect(radios.compatibility).toBeChecked();
-      expect(radios.legacy).not.toBeChecked();
       expect(radios.matrix20).not.toBeChecked();
       // None are disabled by config; only Matrix_2_0 may be disabled by sticky-events support.
-      expect(radios.legacy).not.toBeDisabled();
       expect(radios.compatibility).not.toBeDisabled();
     });
 
-    it.each([
-      MatrixRTCMode.Legacy,
-      MatrixRTCMode.Compatibility,
-      MatrixRTCMode.Matrix_2_0,
-    ])(
+    it.each([MatrixRTCMode.Compatibility, MatrixRTCMode.Matrix_2_0])(
       "disables all radios and shows the config value (%s) as checked when matrix_rtc_mode is set",
       async (configMode) => {
         mockConfig({ matrix_rtc_mode: configMode });
         // Local setting is intentionally different from the config value to
         // prove config wins.
         matrixRTCModeSetting.setValue(
-          configMode === MatrixRTCMode.Legacy
-            ? MatrixRTCMode.Compatibility
-            : MatrixRTCMode.Legacy,
+          configMode === MatrixRTCMode.Compatibility
+            ? MatrixRTCMode.Matrix_2_0
+            : MatrixRTCMode.Compatibility,
         );
         const client = createMockMatrixClient();
 
@@ -388,6 +392,7 @@ describe("DeveloperSettingsTab", () => {
             <DeveloperSettingsTab
               client={client}
               env={{} as unknown as ImportMetaEnv}
+              vm={outOfCallDeveloperSettingsTabViewModel}
             />
           </TooltipProvider>,
         );
@@ -397,13 +402,11 @@ describe("DeveloperSettingsTab", () => {
         );
 
         const radios = getModeRadios();
-        expect(radios.legacy).toBeDisabled();
         expect(radios.compatibility).toBeDisabled();
         expect(radios.matrix20).toBeDisabled();
 
         const checkedValue = (
           {
-            [MatrixRTCMode.Legacy]: radios.legacy,
             [MatrixRTCMode.Compatibility]: radios.compatibility,
             [MatrixRTCMode.Matrix_2_0]: radios.matrix20,
           } as const
@@ -412,4 +415,74 @@ describe("DeveloperSettingsTab", () => {
       },
     );
   });
+
+  describe("KeyRotationStatus", () => {
+    it("displays active status when key rotation is not suppressed", async () => {
+      const client = createMockMatrixClient();
+      const vm = createStaticViewModel<DeveloperSettingsSnapshot>({
+        keyRotation: { suppressed: false, participantCount: 5 },
+      });
+
+      render(
+        <TooltipProvider>
+          <DeveloperSettingsTab
+            client={client}
+            env={{} as unknown as ImportMetaEnv}
+            vm={vm}
+          />
+        </TooltipProvider>,
+      );
+
+      await waitFor(() =>
+        expect(
+          screen.getByText(/Media key rotation: active \(5 participants\)/),
+        ).toBeInTheDocument(),
+      );
+    });
+
+    it("displays suppressed status when key rotation is suppressed", async () => {
+      const client = createMockMatrixClient();
+      const vm = createStaticViewModel<DeveloperSettingsSnapshot>({
+        keyRotation: { suppressed: true, participantCount: 50 },
+      });
+
+      render(
+        <TooltipProvider>
+          <DeveloperSettingsTab
+            client={client}
+            env={{} as unknown as ImportMetaEnv}
+            vm={vm}
+          />
+        </TooltipProvider>,
+      );
+
+      await waitFor(() =>
+        expect(
+          screen.getByText(
+            /Media key rotation: suppressed, participant limit reached \(50 participants\)/,
+          ),
+        ).toBeInTheDocument(),
+      );
+    });
+
+    it("does not render KeyRotationStatus when not in a call", async () => {
+      const client = createMockMatrixClient();
+
+      render(
+        <TooltipProvider>
+          <DeveloperSettingsTab
+            client={client}
+            env={{} as unknown as ImportMetaEnv}
+            vm={outOfCallDeveloperSettingsTabViewModel}
+          />
+        </TooltipProvider>,
+      );
+
+      await waitFor(() =>
+        expect(
+          screen.queryByText(/Media key rotation:/),
+        ).not.toBeInTheDocument(),
+      );
+    });
+  });
 });

src/settings/DeveloperSettingsTab.tsx

@@ -68,6 +68,39 @@ import settingsStyles from "./SettingsModal.module.css";
 import { Slider } from "../Slider";
 import { useUrlParams } from "../UrlParams";
 import { getSFUConfigWithOpenID } from "../livekit/openIDSFU";
+import { useBehavior } from "../useBehavior";
+import { type ViewModel } from "../state/ViewModel.ts";
+
+/**
+ * The state of MatrixRTC's media key rotation.
+ */
+export interface KeyRotationInfo {
+  /** Whether the call is large enough that MatrixRTC has stopped rotating the media key. */
+  suppressed: boolean;
+  participantCount: number;
+}
+
+/**
+ * The Snapshot combines all fields the developer settings tab needs from the
+ * surrounding call. Everything else in this tab is read from the settings store
+ * or the environment directly.
+ */
+export interface DeveloperSettingsSnapshot {
+  /** The media key rotation state, or `null` when we are not in a call. */
+  keyRotation: KeyRotationInfo | null;
+}
+
+/**
+ * Shows whether the call is large enough that MatrixRTC has stopped rotating the media key.
+ */
+const KeyRotationStatus: FC<{ info: KeyRotationInfo }> = ({ info }) => (
+  <p>
+    Media key rotation:{" "}
+    {info.suppressed
+      ? `suppressed, participant limit reached (${info.participantCount} participants)`
+      : `active (${info.participantCount} participants)`}
+  </p>
+);
 
 interface Props {
   client: MatrixClient;
@@ -79,6 +112,7 @@ interface Props {
     livekitAlias?: string;
   }[];
   env: ImportMetaEnv;
+  vm: ViewModel<DeveloperSettingsSnapshot>;
 }
 
 export const DeveloperSettingsTab: FC<Props> = ({
@@ -86,8 +120,10 @@ export const DeveloperSettingsTab: FC<Props> = ({
   livekitRooms,
   roomId,
   env,
+  vm,
 }) => {
   const { t } = useTranslation();
+  const keyRotation = useBehavior(vm.keyRotation$);
   const [duplicateTiles, setDuplicateTiles] = useSetting(duplicateTilesSetting);
   const [debugTileLayout, setDebugTileLayout] = useSetting(
     debugTileLayoutSetting,
@@ -364,6 +400,7 @@ export const DeveloperSettingsTab: FC<Props> = ({
           id: client.getDeviceId() || "unknown",
         })}
       </p>
+      {keyRotation !== null && <KeyRotationStatus info={keyRotation} />}
       <Separator />
       <FieldRow>
         <InputField
@@ -520,22 +557,6 @@ export const DeveloperSettingsTab: FC<Props> = ({
       </Heading>
       {matrixRTCModeForced && <p>Your deployment overrides the mode.</p>}
       <Form>
-        <InlineField
-          name={matrixRTCModeRadioGroup}
-          control={
-            <RadioControl
-              checked={effectiveMatrixRTCMode === MatrixRTCMode.Legacy}
-              value={MatrixRTCMode.Legacy}
-              disabled={matrixRTCModeForced}
-              onChange={onMatrixRTCModeChange}
-            />
-          }
-        >
-          <Label>{t("developer_mode.matrixRTCMode.Legacy.label")}</Label>
-          <HelpMessage>
-            {t("developer_mode.matrixRTCMode.Legacy.description")}
-          </HelpMessage>
-        </InlineField>
         <InlineField
           name={matrixRTCModeRadioGroup}
           control={

src/settings/DeveloperSettingsTabViewModel.test.ts

@@ -0,0 +1,48 @@
+/*
+Copyright 2026 Element Creations Ltd.
+
+SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial
+Please see LICENSE in the repository root for full details.
+*/
+
+import { describe, expect, it } from "vitest";
+import { BehaviorSubject } from "rxjs";
+
+import { testScope } from "../utils/test";
+import { type CallViewModel } from "../state/CallViewModel/CallViewModel";
+import {
+  createDeveloperSettingsTabViewModel,
+  outOfCallDeveloperSettingsTabViewModel,
+} from "./DeveloperSettingsTabViewModel";
+
+describe("createDeveloperSettingsTabViewModel", () => {
+  it("projects the key rotation state of the call", () => {
+    const keyRotationSuppressed$ = new BehaviorSubject(false);
+    const participantCount$ = new BehaviorSubject(5);
+    const vm = createDeveloperSettingsTabViewModel(testScope(), {
+      keyRotationSuppressed$,
+      participantCount$,
+    } as unknown as CallViewModel);
+
+    expect(vm.keyRotation$.value).toEqual({
+      suppressed: false,
+      participantCount: 5,
+    });
+
+    participantCount$.next(50);
+    keyRotationSuppressed$.next(true);
+
+    expect(vm.keyRotation$.value).toEqual({
+      suppressed: true,
+      participantCount: 50,
+    });
+  });
+});
+
+describe("outOfCallDeveloperSettingsTabViewModel", () => {
+  it("has no key rotation state", () => {
+    expect(outOfCallDeveloperSettingsTabViewModel.keyRotation$.value).toBe(
+      null,
+    );
+  });
+});

src/settings/DeveloperSettingsTabViewModel.ts

@@ -0,0 +1,43 @@
+/*
+Copyright 2026 Element Creations Ltd.
+
+SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial
+Please see LICENSE in the repository root for full details.
+*/
+
+import { combineLatest } from "rxjs";
+
+import { type CallViewModel } from "../state/CallViewModel/CallViewModel.ts";
+import { type ObservableScope } from "../state/ObservableScope.ts";
+import { createStaticViewModel, type ViewModel } from "../state/ViewModel.ts";
+import { type DeveloperSettingsSnapshot } from "./DeveloperSettingsTab.tsx";
+
+/**
+ * Creates the ViewModel for the developer settings tab while in a call.
+ *
+ * Only the call state the tab actually renders is projected here, so that the
+ * tab does not need to know about the CallViewModel.
+ *
+ * @param scope - ObservableScope that bounds the lifetime of derived behaviors.
+ * @param callModel - The root CallViewModel; provides the key rotation state.
+ */
+export function createDeveloperSettingsTabViewModel(
+  scope: ObservableScope,
+  callModel: CallViewModel,
+): ViewModel<DeveloperSettingsSnapshot> {
+  return {
+    keyRotation$: scope.behavior(
+      combineLatest(
+        [callModel.keyRotationSuppressed$, callModel.participantCount$],
+        (suppressed, participantCount) => ({ suppressed, participantCount }),
+      ),
+    ),
+  };
+}
+
+/**
+ * The ViewModel for the developer settings tab outside of a call (lobby, user
+ * menu), where no call state exists. All call specific fields are `null`.
+ */
+export const outOfCallDeveloperSettingsTabViewModel: ViewModel<DeveloperSettingsSnapshot> =
+  createStaticViewModel<DeveloperSettingsSnapshot>({ keyRotation: null });

src/settings/SettingsModal.tsx

@@ -29,11 +29,16 @@ import { PreferencesSettingsTab } from "./PreferencesSettingsTab";
 import { Slider } from "../Slider";
 import { DeviceSelection } from "./DeviceSelection";
 import { useTrackProcessor } from "../livekit/TrackProcessorContext";
-import { DeveloperSettingsTab } from "./DeveloperSettingsTab";
+import {
+  DeveloperSettingsTab,
+  type DeveloperSettingsSnapshot,
+} from "./DeveloperSettingsTab";
 import { FieldRow, InputField } from "../input/Input";
 import { useSubmitRageshake } from "./submit-rageshake";
 import { useUrlParams } from "../UrlParams";
 import { useBehavior } from "../useBehavior";
+import { type ViewModel } from "../state/ViewModel.ts";
+import { outOfCallDeveloperSettingsTabViewModel } from "./DeveloperSettingsTabViewModel";
 
 type SettingsTab =
   | "audio"
@@ -56,6 +61,8 @@ interface Props {
     url: string;
     isLocal?: boolean;
   }[];
+  /** Only available while in a call. Used by the developer tab. */
+  developerSettingsVm?: ViewModel<DeveloperSettingsSnapshot>;
 }
 
 export const defaultSettingsTab: SettingsTab = "audio";
@@ -68,6 +75,7 @@ export const SettingsModal: FC<Props> = ({
   client,
   roomId,
   livekitRooms,
+  developerSettingsVm,
 }) => {
   const { t } = useTranslation();
 
@@ -220,6 +228,7 @@ export const SettingsModal: FC<Props> = ({
         client={client}
         livekitRooms={livekitRooms}
         roomId={roomId}
+        vm={developerSettingsVm ?? outOfCallDeveloperSettingsTabViewModel}
       />
     ),
   };

src/settings/__snapshots__/DeveloperSettingsTab.test.tsx.snap

@@ -285,50 +285,10 @@ exports[`DeveloperSettingsTab > renders and matches snapshot 1`] = `
           class="_container_1ug7n_10"
         >
           <input
-            aria-describedby="radix-_r_a_ radix-_r_c_ radix-_r_e_"
-            class="_input_1ug7n_18"
-            id="radix-_r_9_"
-            name="_r_0_"
-            title=""
-            type="radio"
-            value="legacy"
-          />
-          <div
-            class="_ui_1ug7n_19"
-          />
-        </div>
-      </div>
-      <div
-        class="_inline-field-body_1o4d9_39"
-      >
-        <label
-          class="_label_1o4d9_60"
-          for="radix-_r_9_"
-        >
-          Legacy: state events & oldest membership SFU
-        </label>
-        <span
-          class="_message_1o4d9_86 _help-message_1o4d9_92"
-          id="radix-_r_a_"
-        >
-          Compatible with old versions of EC that do not support multi SFU
-        </span>
-      </div>
-    </div>
-    <div
-      class="_inline-field_1o4d9_33"
-    >
-      <div
-        class="_inline-field-control_1o4d9_45"
-      >
-        <div
-          class="_container_1ug7n_10"
-        >
-          <input
-            aria-describedby="radix-_r_a_ radix-_r_c_ radix-_r_e_"
+            aria-describedby="radix-_r_a_ radix-_r_c_"
             checked=""
             class="_input_1ug7n_18"
-            id="radix-_r_b_"
+            id="radix-_r_9_"
             name="_r_0_"
             title=""
             type="radio"
@@ -344,13 +304,13 @@ exports[`DeveloperSettingsTab > renders and matches snapshot 1`] = `
       >
         <label
           class="_label_1o4d9_60"
-          for="radix-_r_b_"
+          for="radix-_r_9_"
         >
           Compatibility: state events & multi SFU
         </label>
         <span
           class="_message_1o4d9_86 _help-message_1o4d9_92"
-          id="radix-_r_c_"
+          id="radix-_r_a_"
         >
           Compatible with homeservers that do not support sticky events (but all other EC clients are v0.17.0 or later)
         </span>
@@ -366,9 +326,9 @@ exports[`DeveloperSettingsTab > renders and matches snapshot 1`] = `
           class="_container_1ug7n_10"
         >
           <input
-            aria-describedby="radix-_r_a_ radix-_r_c_ radix-_r_e_"
+            aria-describedby="radix-_r_a_ radix-_r_c_"
             class="_input_1ug7n_18"
-            id="radix-_r_d_"
+            id="radix-_r_b_"
             name="_r_0_"
             title=""
             type="radio"
@@ -384,13 +344,13 @@ exports[`DeveloperSettingsTab > renders and matches snapshot 1`] = `
       >
         <label
           class="_label_1o4d9_60"
-          for="radix-_r_d_"
+          for="radix-_r_b_"
         >
           Matrix 2.0: sticky events & multi SFU
         </label>
         <span
           class="_message_1o4d9_86 _help-message_1o4d9_92"
-          id="radix-_r_e_"
+          id="radix-_r_c_"
         >
           Compatible only with homservers supporting sticky events and all EC clients v0.17.0 or later
         </span>
@@ -491,7 +451,7 @@ exports[`DeveloperSettingsTab > renders and matches snapshot 1`] = `
       class="_field_1bd8c0 _checkboxField_1bd8c0"
     >
       <input
-        aria-describedby="_r_k_"
+        aria-describedby="_r_i_"
         id="cameraToggle"
         type="checkbox"
       />
@@ -521,7 +481,7 @@ exports[`DeveloperSettingsTab > renders and matches snapshot 1`] = `
       </label>
       <p
         class="_description_1bd8c0"
-        id="_r_k_"
+        id="_r_i_"
       >
         Configure resolution, framerate, bitrate, and codec for camera video. Changes apply on next call join.
       </p>
@@ -543,7 +503,7 @@ exports[`DeveloperSettingsTab > renders and matches snapshot 1`] = `
       class="_field_1bd8c0 _checkboxField_1bd8c0"
     >
       <input
-        aria-describedby="_r_l_"
+        aria-describedby="_r_j_"
         id="screenShareToggle"
         type="checkbox"
       />
@@ -573,7 +533,7 @@ exports[`DeveloperSettingsTab > renders and matches snapshot 1`] = `
       </label>
       <p
         class="_description_1bd8c0"
-        id="_r_l_"
+        id="_r_j_"
       >
         Configure resolution, framerate, bitrate, and codec for screen sharing
       </p>
@@ -598,7 +558,7 @@ exports[`DeveloperSettingsTab > renders and matches snapshot 1`] = `
       class="_field_1bd8c0 _checkboxField_1bd8c0"
     >
       <input
-        aria-describedby="_r_m_"
+        aria-describedby="_r_k_"
         checked=""
         id="echoCancellation"
         type="checkbox"
@@ -636,7 +596,7 @@ exports[`DeveloperSettingsTab > renders and matches snapshot 1`] = `
       class="_field_1bd8c0 _checkboxField_1bd8c0"
     >
       <input
-        aria-describedby="_r_n_"
+        aria-describedby="_r_l_"
         checked=""
         id="noiseSuppression"
         type="checkbox"
@@ -674,7 +634,7 @@ exports[`DeveloperSettingsTab > renders and matches snapshot 1`] = `
       class="_field_1bd8c0 _checkboxField_1bd8c0"
     >
       <input
-        aria-describedby="_r_o_"
+        aria-describedby="_r_m_"
         checked=""
         id="autoGainControl"
         type="checkbox"

src/state/CallViewModel/CallViewModel.test.ts

@@ -258,11 +258,9 @@ function mockRingEvent(
   } as unknown as { event_id: string } & IRTCNotificationContent;
 }
 
-describe.each([
-  [MatrixRTCMode.Legacy],
-  [MatrixRTCMode.Compatibility],
-  [MatrixRTCMode.Matrix_2_0],
-])("CallViewModel (%s mode)", (mode) => {
+const modes = [[MatrixRTCMode.Compatibility], [MatrixRTCMode.Matrix_2_0]];
+
+describe.each(modes)("CallViewModel (%s mode)", (mode) => {
   const withCallViewModel = withCallViewModelInMode(mode);
 
   test("participants are retained during a focus switch", () => {

src/state/CallViewModel/CallViewModel.ts

@@ -114,6 +114,7 @@ import {
   type LocalTransport,
 } from "./localMember/LocalTransport.ts";
 import {
+  createKeyRotationSuppressed$,
   createMemberships$,
   membershipsAndTransports$,
 } from "../SessionBehaviors.ts";
@@ -302,6 +303,12 @@ export interface CallViewModel {
    *    multiple devices.
    */
   participantCount$: Behavior<number>;
+  /**
+   * Whether the call has grown large enough that MatrixRTC has stopped rotating the media
+   * encryption key. While this is true the key in use is still shared with new joiners, but no new
+   * key is generated when someone joins or leaves.
+   */
+  keyRotationSuppressed$: Behavior<boolean>;
   allConnections$: Behavior<ConnectionManagerData>;
   /** Participants sorted by livekit room so they can be used in the audio rendering */
   livekitRoomItems$: Behavior<LivekitRoomItem[]>;
@@ -366,6 +373,11 @@ export interface CallViewModel {
    */
   overflowing$: Behavior<boolean>;
 
+  /**
+   * Whether modals such as settings and reactions should be accessible at all.
+   */
+  showModals$: Behavior<boolean>;
+
   settingsOpen$: Behavior<boolean>;
   setSettingsOpen$: Behavior<(open: boolean) => void>;
 
@@ -436,7 +448,7 @@ export function createCallViewModel$(
   const matrixRTCMode$ =
     configMatrixRTCMode !== undefined
       ? constant(configMatrixRTCMode)
-      : (options.matrixRTCMode$ ?? constant(MatrixRTCMode.Legacy));
+      : (options.matrixRTCMode$ ?? constant(MatrixRTCMode.Compatibility));
 
   // Each hbar seperates a block of input variables required for the CallViewModel to function.
   // The outputs of this block is written under the hbar.
@@ -498,7 +510,6 @@ export function createCallViewModel$(
               mode === MatrixRTCMode.Matrix_2_0
                 ? JwtEndpointVersion.Matrix_2_0
                 : JwtEndpointVersion.Legacy,
-            useOldestMember: mode === MatrixRTCMode.Legacy,
           }),
       ),
     ),
@@ -857,6 +868,11 @@ export function createCallViewModel$(
     matrixLivekitMembers$.pipe(map((ms) => ms.length)),
   );
 
+  const keyRotationSuppressed$ = createKeyRotationSuppressed$(
+    scope,
+    matrixRTCSession,
+  );
+
   const leaveSoundEffect$ = userMedia$.pipe(
     pairwise(),
     filter(
@@ -1450,6 +1466,11 @@ export function createCallViewModel$(
       map((naturallyShowFooter) => naturallyShowFooter && showFooterUrlParams),
     ),
   );
+
+  const showModals$ = scope.behavior(
+    windowMode$.pipe(map((mode) => mode !== "pip")),
+  );
+
   const settingsOpen$ = new BehaviorSubject(false);
   const setSettingsOpen$ = constant((open: boolean) => {
     settingsOpen$.next(open);
@@ -1788,6 +1809,7 @@ export function createCallViewModel$(
     ),
     allConnections$,
     participantCount$: participantCount$,
+    keyRotationSuppressed$: keyRotationSuppressed$,
     handsRaised$: handsRaised$,
     reactions$: reactions$,
     joinSoundEffect$: joinSoundEffect$,
@@ -1826,6 +1848,7 @@ export function createCallViewModel$(
     showNameTags$,
     showHeader$: showHeader$,
     showFooter$: showFooter$,
+    showModals$,
     settingsOpen$: settingsOpen$,
     setSettingsOpen$: setSettingsOpen$,
     edgeToEdge$,

src/state/CallViewModel/localMember/LocalMember.test.ts

@@ -59,7 +59,7 @@ import {
 
 initializeWidget();
 
-const MATRIX_RTC_MODE = MatrixRTCMode.Legacy;
+const MATRIX_RTC_MODE = MatrixRTCMode.Compatibility;
 const getUrlParams = vi.hoisted(() => vi.fn(() => ({})));
 vi.mock("../../../UrlParams", () => ({ getUrlParams }));
 vi.mock("@livekit/components-core", () => ({
@@ -71,12 +71,6 @@ vi.mock("@livekit/components-core", () => ({
 describe("LocalMembership", () => {
   describe("enterRTCSession", () => {
     it("It joins the correct Session", () => {
-      const focusFromOlderMembership = {
-        type: "livekit",
-        livekit_service_url: "http://my-oldest-member-service-url.com",
-        livekit_alias: "my-oldest-member-service-alias",
-      };
-
       mockConfig({
         livekit: { livekit_service_url: "http://my-default-service-url.com" },
       });
@@ -95,10 +89,6 @@ describe("LocalMembership", () => {
           },
         },
         memberships: [],
-        getFocusInUse: vi.fn().mockReturnValue(focusFromOlderMembership),
-        getOldestMembership: vi.fn().mockReturnValue({
-          getPreferredFoci: vi.fn().mockReturnValue([focusFromOlderMembership]),
-        }),
         joinRTCSession: vi.fn(),
       }) as unknown as MatrixRTCSession;
 
@@ -122,17 +112,63 @@ describe("LocalMembership", () => {
           memberId: "@alice:example.org:DEVICE",
           userId: "@alice:example.org",
         },
-        [
-          {
-            livekit_alias: "roomId",
-            livekit_service_url: "http://my-livekit-service-url.com",
-            type: "livekit",
+        [],
+        {
+          livekit_alias: "roomId",
+          livekit_service_url: "http://my-livekit-service-url.com",
+          type: "livekit",
+        },
+        expect.objectContaining({ manageMediaKeys: true }),
+      );
+    });
+
+    it("passes keyRotationParticipantLimit from config to joinRTCSession", () => {
+      mockConfig({
+        livekit: { livekit_service_url: "http://my-default-service-url.com" },
+        matrix_rtc_session: {
+          delayed_leave_event_delay_ms: 0,
+          network_error_retry_ms: 0,
+          key_rotation_participant_limit: 50,
+        },
+      });
+
+      const mockedSession = vi.mocked({
+        room: {
+          roomId: "roomId",
+          client: {
+            getDomain: vi.fn().mockReturnValue("example.org"),
+            getOpenIdToken: vi.fn().mockResolvedValue({
+              access_token: "ACCCESS_TOKEN",
+              token_type: "Bearer",
+              matrix_server_name: "localhost",
+              expires_in: 10000,
+            }),
           },
-        ],
-        undefined,
+        },
+        memberships: [],
+        joinRTCSession: vi.fn(),
+      }) as unknown as MatrixRTCSession;
+
+      enterRTCSession(
+        mockedSession,
+        ownMemberMock,
+        {
+          livekit_alias: "roomId",
+          livekit_service_url: "http://my-livekit-service-url.com",
+          type: "livekit",
+        },
+        {
+          encryptMedia: true,
+          matrixRTCMode: MATRIX_RTC_MODE,
+        },
+      );
+
+      expect(mockedSession.joinRTCSession).toHaveBeenLastCalledWith(
+        expect.any(Object),
+        [],
+        expect.any(Object),
         expect.objectContaining({
-          manageMediaKeys: true,
-          useLegacyMemberEvents: false,
+          keyRotationParticipantLimit: 50,
         }),
       );
     });

src/state/CallViewModel/localMember/LocalMember.ts

@@ -117,7 +117,6 @@ export type LocalMemberState =
     };
 
 /*
- * - get oldest membership
  * - get transport to use
  * - get openId + jwt token
  * - wait for createTrack() call
@@ -851,9 +850,7 @@ export function enterRTCSession(
   // have started tracking by the time calls start getting created.
   // groupCallOTelMembership?.onJoinCall();
 
-  const { features, matrix_rtc_session: matrixRtcSessionConfig } = Config.get();
-  const useDeviceSessionMemberEvents =
-    features?.feature_use_device_session_member_events;
+  const { matrix_rtc_session: matrixRtcSessionConfig } = Config.get();
   const { sendNotificationType: notificationType, callIntent } = getUrlParams();
   const multiSFU =
     matrixRTCMode === MatrixRTCMode.Compatibility ||
@@ -895,9 +892,6 @@ export function enterRTCSession(
       notificationType,
       callIntent,
       manageMediaKeys: encryptMedia,
-      ...(useDeviceSessionMemberEvents !== undefined && {
-        useLegacyMemberEvents: !useDeviceSessionMemberEvents,
-      }),
       delayedLeaveEventRestartMs:
         matrixRtcSessionConfig?.delayed_leave_event_restart_ms,
       delayedLeaveEventDelayMs:
@@ -908,6 +902,8 @@ export function enterRTCSession(
       makeKeyDelay: matrixRtcSessionConfig?.wait_for_key_rotation_ms,
       membershipEventExpiryMs:
         matrixRtcSessionConfig?.membership_event_expiry_ms,
+      keyRotationParticipantLimit:
+        matrixRtcSessionConfig?.key_rotation_participant_limit,
       unstableSendStickyEvents: matrixRTCMode === MatrixRTCMode.Matrix_2_0,
       maximumNetworkErrorRetryCount: maximumNetworkErrorRetryCount,
     },

src/state/CallViewModel/localMember/LocalTransport.test.ts

@@ -13,7 +13,6 @@ import {
   it,
   type MockedObject,
   vi,
-  type MockInstance,
 } from "vitest";
 import {
   type CallMembership,
@@ -26,7 +25,6 @@ import {
   mockConfig,
   flushPromises,
   ownMemberMock,
-  mockRtcMembership,
   testScope,
 } from "../../../utils/test";
 import {
@@ -35,7 +33,7 @@ import {
   type LocalTransportWithSFUConfig,
 } from "./LocalTransport";
 import { constant } from "../../Behavior";
-import { Epoch, ObservableScope, trackEpoch } from "../../ObservableScope";
+import { Epoch, ObservableScope } from "../../ObservableScope";
 import {
   MatrixRTCTransportMissingError,
   FailToGetOpenIdToken,
@@ -58,7 +56,6 @@ describe("LocalTransport", () => {
     const { advertised$, active$ } = createLocalTransport$({
       scope: testScope(),
       roomId: "!room:example.org",
-      useOldestMember: false,
       memberships$: constant(new Epoch<CallMembership[]>([])),
       client: {
         // eslint-disable-next-line @typescript-eslint/naming-convention
@@ -101,7 +98,6 @@ describe("LocalTransport", () => {
     const { advertised$, active$ } = createLocalTransport$({
       scope,
       roomId: "!example_room_id",
-      useOldestMember: false,
       memberships$: constant(new Epoch<CallMembership[]>([])),
       client: {
         baseUrl: "https://example.org",
@@ -144,7 +140,6 @@ describe("LocalTransport", () => {
     const { advertised$, active$ } = createLocalTransport$({
       scope: testScope(),
       roomId: "!room:example.org",
-      useOldestMember: false,
       memberships$: constant(new Epoch<CallMembership[]>([])),
       client: {
         // eslint-disable-next-line @typescript-eslint/naming-convention
@@ -185,127 +180,6 @@ describe("LocalTransport", () => {
     });
   });
 
-  describe("oldest member mode", () => {
-    const aliceTransport: LivekitTransportConfig = {
-      type: "livekit",
-      livekit_service_url: "https://alice.example.org",
-    };
-    const bobTransport: LivekitTransportConfig = {
-      type: "livekit",
-      livekit_service_url: "https://bob.example.org",
-    };
-    const aliceMembership = mockRtcMembership("@alice:example.org", "AAA", {
-      fociPreferred: [aliceTransport],
-    });
-    const bobMembership = mockRtcMembership("@bob:example.org", "BBB", {
-      fociPreferred: [bobTransport],
-    });
-
-    let openIdSpy: MockInstance<(typeof openIDSFU)["getSFUConfigWithOpenID"]>;
-    beforeEach(() => {
-      openIdSpy = vi
-        .spyOn(openIDSFU, "getSFUConfigWithOpenID")
-        .mockResolvedValue(openIdResponse);
-    });
-
-    it("updates active transport when oldest member changes", async () => {
-      // Initially, Alice is the only member
-      const memberships$ = new BehaviorSubject([aliceMembership]);
-
-      const scope = testScope();
-      const { advertised$, active$ } = createLocalTransport$({
-        scope,
-        roomId: "!example_room_id",
-        useOldestMember: true,
-        memberships$: scope.behavior(memberships$.pipe(trackEpoch())),
-        client: {
-          getDomain: () => "example.org",
-          // eslint-disable-next-line @typescript-eslint/naming-convention
-          _unstable_getRTCTransports: async () => Promise.resolve([]),
-          getOpenIdToken: vi.fn(),
-          getDeviceId: vi.fn(),
-          baseUrl: "https://example.org",
-        },
-        ownMembershipIdentity: ownMemberMock,
-        forceJwtEndpoint: JwtEndpointVersion.Legacy,
-        delayId$: constant("delay_id_mock"),
-      });
-
-      expect(active$.value).toBe(null);
-      await flushPromises();
-      // SFU config should've been fetched
-      expect(openIdSpy).toHaveBeenCalled();
-      // Alice's transport should be active and advertised
-      expect(active$.value?.transport).toStrictEqual(aliceTransport);
-      expect(advertised$.value).toStrictEqual(aliceTransport);
-
-      // Now Bob joins the call, but Alice is still the oldest member
-      openIdSpy.mockClear();
-      memberships$.next([aliceMembership, bobMembership]);
-      await flushPromises();
-      // No new SFU config should've been fetched
-      expect(openIdSpy).not.toHaveBeenCalled();
-      // Alice's transport should still be active and advertised
-      expect(active$.value?.transport).toStrictEqual(aliceTransport);
-      expect(advertised$.value).toStrictEqual(aliceTransport);
-
-      // Now Bob takes Alice's place as the oldest member
-      openIdSpy.mockClear();
-      memberships$.next([bobMembership, aliceMembership]);
-      // Active transport should reset to null until we have Bob's SFU config
-      expect(active$.value).toStrictEqual(null);
-      await flushPromises();
-      // Bob's SFU config should've been fetched
-      expect(openIdSpy).toHaveBeenCalled();
-      // Bob's transport should be active, but Alice's should remain advertised
-      // (since we don't want the change in oldest member to cause a wave of new
-      // state events)
-      expect(active$.value?.transport).toStrictEqual(bobTransport);
-      expect(advertised$.value).toStrictEqual(aliceTransport);
-    });
-
-    it("advertises preferred transport when no other member exists", async () => {
-      // Initially, there are no members
-      const memberships$ = new BehaviorSubject<CallMembership[]>([]);
-
-      const scope = testScope();
-      const { advertised$, active$ } = createLocalTransport$({
-        scope,
-        roomId: "!example_room_id",
-        useOldestMember: true,
-        memberships$: scope.behavior(memberships$.pipe(trackEpoch())),
-        client: {
-          getDomain: () => "example.org",
-          // eslint-disable-next-line @typescript-eslint/naming-convention
-          _unstable_getRTCTransports: async () =>
-            Promise.resolve([aliceTransport]),
-          getOpenIdToken: vi.fn(),
-          getDeviceId: vi.fn(),
-          baseUrl: "https://example.org",
-        },
-        ownMembershipIdentity: ownMemberMock,
-        forceJwtEndpoint: JwtEndpointVersion.Legacy,
-        delayId$: constant("delay_id_mock"),
-      });
-
-      expect(active$.value).toBe(null);
-      await flushPromises();
-      // Our own preferred transport should be advertised
-      expect(advertised$.value).toStrictEqual(aliceTransport);
-      // No transport should be active however (there is still no oldest member)
-      expect(active$.value).toBe(null);
-
-      // Now Bob joins the call and becomes the oldest member
-      memberships$.next([bobMembership]);
-      await flushPromises();
-      // We should still advertise our own preferred transport (to avoid
-      // unnecessary state changes)
-      expect(advertised$.value).toStrictEqual(aliceTransport);
-      // Bob's transport should become active
-      expect(active$.value?.transport).toBe(bobTransport);
-    });
-  });
-
   type LocalTransportProps = Parameters<typeof createLocalTransport$>[0];
 
   describe("transport configuration mechanisms", () => {
@@ -320,7 +194,6 @@ describe("LocalTransport", () => {
         ownMembershipIdentity: ownMemberMock,
         scope: testScope(),
         roomId: "!example_room_id",
-        useOldestMember: false,
         forceJwtEndpoint: JwtEndpointVersion.Legacy,
         delayId$: constant(null),
         memberships$: constant(new Epoch<CallMembership[]>([])),
@@ -433,7 +306,6 @@ describe("LocalTransport", () => {
         scope: testScope(),
         ownMembershipIdentity: ownMemberMock,
         roomId: "!example_room_id",
-        useOldestMember: false,
         forceJwtEndpoint: JwtEndpointVersion.Legacy,
         delayId$: constant(null),
         memberships$: constant(new Epoch<CallMembership[]>([])),
@@ -473,7 +345,6 @@ describe("LocalTransport", () => {
       ownMembershipIdentity: ownMemberMock,
       roomId: "!example_room_id",
       // We want multi-sdu
-      useOldestMember: false,
       forceJwtEndpoint: JwtEndpointVersion.Legacy,
       delayId$: delayId$,
       memberships$: constant(new Epoch<CallMembership[]>([])),

src/state/CallViewModel/localMember/LocalTransport.ts

@@ -7,23 +7,16 @@ Please see LICENSE in the repository root for full details.
 
 import {
   type CallMembership,
-  isLivekitTransportConfig,
   type LivekitTransportConfig,
 } from "matrix-js-sdk/lib/matrixrtc";
 import { type MatrixClient } from "matrix-js-sdk";
 import {
-  catchError,
   combineLatest,
   distinctUntilChanged,
-  first,
   from,
   map,
-  merge,
-  type Observable,
   of,
-  startWith,
   switchMap,
-  tap,
 } from "rxjs";
 import { logger as rootLogger, type Logger } from "matrix-js-sdk/lib/logger";
 import { type CallMembershipIdentityParts } from "matrix-js-sdk/lib/matrixrtc/EncryptionManager";
@@ -47,8 +40,7 @@ import { RtcTransportAutoDiscovery } from "./RtcTransportAutoDiscovery.ts";
 
 /*
  * It figures out “which LiveKit focus URL/alias the local user should use,”
- * optionally aligning with the oldest member, and ensures the SFU path is primed
- * before advertising that choice.
+ * and ensures the SFU path is primed before advertising that choice.
  */
 interface Props {
   scope: ObservableScope;
@@ -61,7 +53,6 @@ interface Props {
     OpenIDClientParts;
   // Used by the jwt service to create the livekit room and compute the livekit alias.
   roomId: string;
-  useOldestMember: boolean;
   forceJwtEndpoint: JwtEndpointVersion;
   delayId$: Behavior<string | null>;
 }
@@ -119,8 +110,6 @@ export interface LocalTransport {
 /**
  * Connects to the JWT service and determines the transports that the local member should use.
  *
- * @prop useOldestMember Whether to use the same transport as the oldest member.
- * This will only update once the first oldest member appears. Will not recompute if the oldest member leaves.
  * @prop useOldJwtEndpoint Whether to set forceOldJwtEndpoint on the returned transport and to use the old JWT endpoint.
  * This is used when the connection manager needs to know if it has to use the legacy endpoint which implies a string concatenated rtcBackendIdentity.
  * (which is expected for non sticky event based rtc member events)
@@ -133,18 +122,10 @@ export const createLocalTransport$ = ({
   ownMembershipIdentity,
   client,
   roomId,
-  useOldestMember,
   forceJwtEndpoint,
   delayId$,
 }: Props): LocalTransport => {
   const logger = rootLogger.getChild("[LocalTransport]");
-  // The LiveKit transport in use by the oldest RTC membership. `null` when the
-  // oldest member has no such transport.
-  const oldestMemberTransport$ = observerOldestMembership$(
-    scope,
-    memberships$,
-    logger,
-  );
 
   const transportDiscovery = new RtcTransportAutoDiscovery({
     client: client,
@@ -203,19 +184,6 @@ export const createLocalTransport$ = ({
     }),
   );
 
-  if (useOldestMember) {
-    return observeLocalTransportForOldestMembership(
-      scope,
-      oldestMemberTransport$,
-      preferredTransport$,
-      client,
-      ownMembershipIdentity,
-      roomId,
-      logger,
-    );
-  }
-
-  // --- Multi-SFU mode ---
   // Always publish on and advertise the preferred transport.
   return {
     advertised$: scope.behavior(
@@ -243,47 +211,6 @@ export const createLocalTransport$ = ({
   };
 };
 
-/**
- * Observes the oldest member in the room and returns the transport that it uses if it is a livekit transport.
- * @param scope - The observable scope.
- * @param memberships$ - The observable of the call's memberships.'
- */
-function observerOldestMembership$(
-  scope: ObservableScope,
-  memberships$: Behavior<Epoch<CallMembership[]>>,
-  logger: Logger,
-): Behavior<LivekitTransportConfig | null> {
-  return scope.behavior<LivekitTransportConfig | null>(
-    memberships$.pipe(
-      map((memberships) => {
-        const oldestMember = memberships.value[0];
-        if (oldestMember === undefined) {
-          logger.info("Oldest member: not found");
-          return null;
-        }
-        const transport = oldestMember.getTransport(oldestMember);
-        if (transport === undefined) {
-          logger.warn(
-            `Oldest member: ${oldestMember.userId}|${oldestMember.deviceId}|${oldestMember.memberId} has no transport`,
-          );
-          return null;
-        }
-        if (!isLivekitTransportConfig(transport)) {
-          logger.warn(
-            `Oldest member: ${oldestMember.userId}|${oldestMember.deviceId}|${oldestMember.memberId} has invalid transport`,
-          );
-          return null;
-        }
-        logger.info(
-          "Oldest member: ${oldestMember.userId}|${oldestMember.deviceId}|${oldestMember.memberId} has valid transport",
-        );
-        return transport;
-      }),
-      distinctUntilChanged(areLivekitTransportsEqual),
-    ),
-  );
-}
-
 /**
  *  Utility to ensure the user can authenticate with the SFU.
  *  We will call `getSFUConfigWithOpenID` once per transport here as it's our
@@ -331,85 +258,6 @@ async function doOpenIdAndJWTFromUrl(
   };
 }
 
-function observeLocalTransportForOldestMembership(
-  scope: ObservableScope,
-  oldestMemberTransport$: Behavior<LivekitTransportConfig | null>,
-  preferredTransport$: Observable<LocalTransportWithSFUConfig>,
-  client: Pick<
-    MatrixClient,
-    "getDomain" | "baseUrl" | "_unstable_getRTCTransports"
-  > &
-    OpenIDClientParts,
-  ownMembershipIdentity: CallMembershipIdentityParts,
-  roomId: string,
-  logger: Logger,
-): LocalTransport {
-  // Ensure we can authenticate with the SFU.
-  const authenticatedOldestMemberTransport$ = oldestMemberTransport$.pipe(
-    switchMap((transport) => {
-      // Oldest member not available -we are first- (or invalid SFU config).
-      if (transport === null) return of(null);
-
-      // Whenever there is transport change we want to revert
-      // to no transport while we do the authentication.
-      // So do a from(promise) here to be able to startWith(null)
-      return from(
-        doOpenIdAndJWTFromUrl(
-          transport,
-          JwtEndpointVersion.Legacy,
-          ownMembershipIdentity,
-          roomId,
-          client,
-          undefined,
-          logger,
-        ),
-      ).pipe(
-        catchError((e: unknown) => {
-          logger.error(
-            `Failed to authenticate to transport ${transport.livekit_service_url}`,
-            e,
-          );
-          throw mapAuthErrorToUserFriendlyError(e);
-        }),
-        startWith(null),
-      );
-    }),
-  );
-
-  // --- Oldest member mode ---
-  return {
-    // Never update the transport that we advertise in our membership. Just
-    // take the first valid oldest member or preferred transport that we learn
-    // about, and stick with that. This avoids unnecessary SFU hops and room
-    // state changes.
-    advertised$: scope.behavior(
-      merge(
-        authenticatedOldestMemberTransport$.pipe(
-          map((t) => t?.transport ?? null),
-        ),
-        preferredTransport$.pipe(map((t) => t.transport)),
-      ).pipe(
-        first((t) => t !== null),
-        tap((t) =>
-          logger.info(`Advertise transport: ${t.livekit_service_url}`),
-        ),
-      ),
-      null,
-    ),
-    // Publish on the transport used by the oldest member.
-    active$: scope.behavior(
-      authenticatedOldestMemberTransport$.pipe(
-        tap((t) =>
-          logger.info(
-            `Publish on transport: ${t?.transport.livekit_service_url}`,
-          ),
-        ),
-      ),
-      null,
-    ),
-  };
-}
-
 function mapAuthErrorToUserFriendlyError(e: unknown): Error {
   if (
     e instanceof FailToGetOpenIdToken ||

src/state/CallViewModel/remoteMembers/Connection.ts

@@ -36,7 +36,6 @@ import {
   SFURoomCreationRestrictedError,
   UnknownCallError,
 } from "../../../utils/errors.ts";
-import { type JwtEndpointVersion } from "../localMember/LocalTransport.ts";
 
 export interface ConnectionOpts {
   /**
@@ -44,11 +43,6 @@ export interface ConnectionOpts {
    * On top the local transport will send additional data to the jwt server to use delayed event delegation.
    */
   existingSFUConfig?: SFUConfig;
-  /**
-   * For local connections that use the oldest member pattern. here we have not prefetched the sfuConfig
-   * and hence we need to let the connection do the jwt token fetching.
-   */
-  forceJwtEndpoint?: JwtEndpointVersion;
   /** The identity parts to use on this connection */
   ownMembershipIdentity: CallMembershipIdentityParts;
   /** The media transport to connect to. */

src/state/CallViewModelWidget.test.ts

@@ -35,11 +35,7 @@ vi.mock("../widget", () => ({
   },
 }));
 
-it.each([
-  [MatrixRTCMode.Legacy],
-  [MatrixRTCMode.Compatibility],
-  [MatrixRTCMode.Matrix_2_0],
-])(
+it.each([[MatrixRTCMode.Compatibility], [MatrixRTCMode.Matrix_2_0]])(
   "expect leave when ElementWidgetActions.HangupCall is called (%s mode)",
   async (mode) => {
     const pr = Promise.withResolvers<string>();

src/state/SessionBehaviors.test.ts

@@ -0,0 +1,41 @@
+/*
+Copyright 2025 Element Creations Ltd.
+
+SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial
+Please see LICENSE in the repository root for full details.
+*/
+
+import { describe, expect, it, vi } from "vitest";
+import { MatrixRTCSessionEvent } from "matrix-js-sdk/lib/matrixrtc";
+import { EventEmitter } from "events";
+
+import { createKeyRotationSuppressed$ } from "./SessionBehaviors";
+import { testScope } from "../utils/test";
+
+describe("SessionBehaviors", () => {
+  describe("createKeyRotationSuppressed$", () => {
+    it("emits initial value from isKeyRotationSuppressed and updates when KeyRotationSuppressedChanged event is emitted", () => {
+      const scope = testScope();
+      const emitter = new EventEmitter();
+      const mockSession = Object.assign(emitter, {
+        on: vi.fn(),
+        off: vi.fn(),
+        isKeyRotationSuppressed: false,
+      });
+
+      const keyRotationSuppressed$ = createKeyRotationSuppressed$(
+        scope,
+        mockSession as any,
+      );
+
+      expect(keyRotationSuppressed$.value).toBe(false);
+      emitter.emit(MatrixRTCSessionEvent.KeyRotationSuppressedChanged, true);
+
+      expect(keyRotationSuppressed$.value).toBe(true);
+
+      emitter.emit(MatrixRTCSessionEvent.KeyRotationSuppressedChanged, false);
+
+      expect(keyRotationSuppressed$.value).toBe(false);
+    });
+  });
+});

src/state/SessionBehaviors.ts

@@ -88,3 +88,22 @@ export const createMemberships$ = (
     new Epoch(matrixRTCSession.memberships),
   );
 };
+
+/**
+ * Whether the session has grown large enough that MatrixRTC has stopped rotating the media
+ * encryption key. While this is true the key in use is still shared with new joiners, but no new
+ * key is generated when someone joins or leaves.
+ */
+export const createKeyRotationSuppressed$ = (
+  scope: ObservableScope,
+  matrixRTCSession: MatrixRTCSession,
+): Behavior<boolean> => {
+  return scope.behavior(
+    fromEvent(
+      matrixRTCSession,
+      MatrixRTCSessionEvent.KeyRotationSuppressedChanged,
+      (suppressed: boolean) => suppressed,
+    ),
+    matrixRTCSession.isKeyRotationSuppressed,
+  );
+};

src/utils/test-viewmodel.ts

@@ -42,6 +42,8 @@ import { MatrixRTCMode } from "../config/ConfigOptions";
 import { createCallFooterViewModel } from "../components/CallFooterViewModel";
 import { type FooterSnapshot } from "../components/CallFooter";
 import { type ViewModel } from "../state/ViewModel";
+import { createDeveloperSettingsTabViewModel } from "../settings/DeveloperSettingsTabViewModel";
+import { type DeveloperSettingsSnapshot } from "../settings/DeveloperSettingsTab";
 
 mockConfig({ livekit: { livekit_service_url: "https://example.com" } });
 
@@ -140,6 +142,7 @@ export function getBasicCallViewModelEnvironment(
 ): {
   vm: CallViewModel;
   footerVm: ViewModel<FooterSnapshot>;
+  developerSettingsVm: ViewModel<DeveloperSettingsSnapshot>;
   rtcMemberships$: BehaviorSubject<CallMembership[]>;
   rtcSession: MockRTCSession;
   handRaisedSubject$: BehaviorSubject<Record<string, RaisedHandInfo>>;
@@ -171,7 +174,7 @@ export function getBasicCallViewModelEnvironment(
           setE2EEEnabled: async () => Promise.resolve(),
         }),
       connectionState$: constant(ConnectionState.Connected),
-      matrixRTCMode$: constant(MatrixRTCMode.Legacy),
+      matrixRTCMode$: constant(MatrixRTCMode.Compatibility),
       ...callViewModelOptions,
     },
     handRaisedSubject$,
@@ -188,6 +191,7 @@ export function getBasicCallViewModelEnvironment(
   return {
     vm,
     footerVm,
+    developerSettingsVm: createDeveloperSettingsTabViewModel(testScope(), vm),
     rtcMemberships$,
     rtcSession,
     handRaisedSubject$: handRaisedSubject$,

src/utils/test.ts

@@ -237,7 +237,7 @@ export function mockRtcMembership(
       fociPreferred: [exampleTransport],
       focusActive: {
         type: "livekit" as const,
-        focus_selection: "oldest_membership" as const,
+        focus_selection: "multi_sfu" as const,
       },
       callId: "",
       membership: {},
@@ -463,9 +463,6 @@ export class MockRTCSession extends TypedEventEmitter<
     session.reemitEncryptionKeys = vi
       .fn<() => void>()
       .mockReturnValue(undefined);
-    session.getOldestMembership = vi
-      .fn<() => CallMembership | undefined>()
-      .mockReturnValue(this.memberships[0]);
 
     return session;
   }
@@ -490,6 +487,8 @@ export class MockRTCSession extends TypedEventEmitter<
     return this.joined;
   }
 
+  public isKeyRotationSuppressed = false;
+
   public withMemberships(
     rtcMembers$: Behavior<Partial<CallMembership>[]>,
   ): MockRTCSession {