From 4c2240261e2feeab3a93206faef9f6c3c20723db Mon Sep 17 00:00:00 2001
From: Robin <robin@robin.town>
Date: Fri, 16 Jan 2026 18:26:21 +0100
Subject: [PATCH] Make Element Call widgets compatible with Matrix 2.0 mode

This gives Element Call widgets the ability to send and receive sticky RTC membership events.
---
 locales/en/app.json |  2 +-
 package.json        |  4 ++--
 src/widget.ts       |  3 +++
 yarn.lock           | 20 ++++++++++----------
 4 files changed, 16 insertions(+), 13 deletions(-)

diff --git a/locales/en/app.json b/locales/en/app.json
index c70a0a49..0b0ac7b4 100644
--- a/locales/en/app.json
+++ b/locales/en/app.json
@@ -116,7 +116,7 @@
     "matrix_rtc_transport_missing": "The server is not configured to work with {{brand}}. Please contact your server admin (Domain: {{domain}}, Error Code: {{ errorCode }}).",
     "membership_manager": "Membership Manager Error",
     "membership_manager_description": "The Membership Manager had to shut down. This is caused by many consequtive failed network requests.",
-    "no_matrix_2_authorization_service": "Your authorization service for you media server (SFU) is not on the newest version",
+    "no_matrix_2_authorization_service": "The authorization service for your media server (SFU) is out of date.",
     "open_elsewhere": "Opened in another tab",
     "open_elsewhere_description": "{{brand}} has been opened in another tab. If that doesn't sound right, try reloading the page.",
     "room_creation_restricted": "Failed to create call",
diff --git a/package.json b/package.json
index 04308630..1ee8ff04 100644
--- a/package.json
+++ b/package.json
@@ -104,8 +104,8 @@
     "livekit-client": "^2.13.0",
     "lodash-es": "^4.17.21",
     "loglevel": "^1.9.1",
-    "matrix-js-sdk": "matrix-org/matrix-js-sdk#develop",
-    "matrix-widget-api": "^1.14.0",
+    "matrix-js-sdk": "matrix-org/matrix-js-sdk#robin/sticky-embedded",
+    "matrix-widget-api": "^1.16.0",
     "node-stdlib-browser": "^1.3.1",
     "normalize.css": "^8.0.1",
     "observable-hooks": "^4.2.3",
diff --git a/src/widget.ts b/src/widget.ts
index 7862df33..37d3f507 100644
--- a/src/widget.ts
+++ b/src/widget.ts
@@ -110,6 +110,7 @@ export const widget = ((): WidgetHelpers | null => {
         EventType.RoomRedaction,
         ElementCallReactionEventType,
         EventType.RTCDecline,
+        EventType.RTCMembership,
       ];
 
       const sendState = [
@@ -154,6 +155,8 @@ export const widget = ((): WidgetHelpers | null => {
           turnServers: false,
           sendDelayedEvents: true,
           updateDelayedEvents: true,
+          sendSticky: true,
+          receiveSticky: true,
         },
         roomId,
         {
diff --git a/yarn.lock b/yarn.lock
index 167ab618..a810222c 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -8364,8 +8364,8 @@ __metadata:
     livekit-client: "npm:^2.13.0"
     lodash-es: "npm:^4.17.21"
     loglevel: "npm:^1.9.1"
-    matrix-js-sdk: "matrix-org/matrix-js-sdk#develop"
-    matrix-widget-api: "npm:^1.14.0"
+    matrix-js-sdk: "matrix-org/matrix-js-sdk#robin/sticky-embedded"
+    matrix-widget-api: "npm:^1.16.0"
     node-stdlib-browser: "npm:^1.3.1"
     normalize.css: "npm:^8.0.1"
     observable-hooks: "npm:^4.2.3"
@@ -11452,9 +11452,9 @@ __metadata:
   languageName: node
   linkType: hard
 
-"matrix-js-sdk@matrix-org/matrix-js-sdk#develop":
-  version: 39.4.0
-  resolution: "matrix-js-sdk@https://github.com/matrix-org/matrix-js-sdk.git#commit=4d0d32307eb4f1ce1fb65080fcca704f5bdedc31"
+"matrix-js-sdk@matrix-org/matrix-js-sdk#robin/sticky-embedded":
+  version: 40.0.0
+  resolution: "matrix-js-sdk@https://github.com/matrix-org/matrix-js-sdk.git#commit=fafa85ddae9b1989573beac0ef71897ba69f1df3"
   dependencies:
     "@babel/runtime": "npm:^7.12.5"
     "@matrix-org/matrix-sdk-crypto-wasm": "npm:^17.0.0"
@@ -11470,17 +11470,17 @@ __metadata:
     sdp-transform: "npm:^3.0.0"
     unhomoglyph: "npm:^1.0.6"
     uuid: "npm:13"
-  checksum: 10c0/59c9d81ccf823584dc783502cb5c928562e3490c63f5ce98ee3232a603545d6278e90dc951c1fd0bae2792ba732ec5171e03596fd396bb2150d596cebb7fbac9
+  checksum: 10c0/b59206fbb2e19293791e680c773c99ee122ac2e5791baf966dd718745015e733d5953bc92506c0de2f148162a7ea9fd285a7ff6b863defd020271fd832c0497b
   languageName: node
   linkType: hard
 
-"matrix-widget-api@npm:^1.14.0":
-  version: 1.15.0
-  resolution: "matrix-widget-api@npm:1.15.0"
+"matrix-widget-api@npm:^1.14.0, matrix-widget-api@npm:^1.16.0":
+  version: 1.16.0
+  resolution: "matrix-widget-api@npm:1.16.0"
   dependencies:
     "@types/events": "npm:^3.0.0"
     events: "npm:^3.2.0"
-  checksum: 10c0/1c08b5284cd98aed312d95594335e1391d937dfad70ef862a1f90fdbaaa27709e1c44dcda37f8045e4814779d8d5816d240aee396d52cfd9b37fbf243a6baf6a
+  checksum: 10c0/261aba7c5a4e8e00e7bfb3df9c5d3786c245035a6adf4f864fba0352ccaf4a14d68243d98f4fe6ffcbd28cd61bcf453047804cb9e9dd867eed06fd97db2e62e3
   languageName: node
   linkType: hard