Backport "Avoid closing the widget in returnToLobby mode" to v0.7

This is a manual backport of 28c45c6107 which makes the video room behavior consistent across the v0.7.2 patch release and development versions.

src/rtcSessionHelpers.ts

@@ -17,6 +17,7 @@ import {
 import { PosthogAnalytics } from "./analytics/PosthogAnalytics";
 import { Config } from "./config/Config";
 import { ElementWidgetActions, WidgetHelpers, widget } from "./widget";
+import { getUrlParams } from "./UrlParams";
 
 const FOCI_WK_KEY = "org.matrix.msc4143.rtc_foci";
 
@@ -135,7 +136,22 @@ const widgetPostHangupProcedure = async (
   // We send the hangup event after the memberships have been updated
   // calling leaveRTCSession.
   // We need to wait because this makes the client hosting this widget killing the IFrame.
-  await widget.api.transport.send(ElementWidgetActions.HangupCall, {});
+  try {
+    await widget.api.transport.send(ElementWidgetActions.HangupCall, {});
+  } catch (e) {
+    logger.error("Failed to send hangup action", e);
+  }
+  // To make the hangup procedure behave more similarly to what future versions
+  // of Element Call will do, we additionally send a close action (even though
+  // we're not yet employing the distinction between 'hangup' and 'close' to
+  // display error screens)
+  if (!getUrlParams().returnToLobby) {
+    try {
+      await widget.api.transport.send(ElementWidgetActions.Close, {});
+    } catch (e) {
+      logger.error("Failed to send close action", e);
+    }
+  }
 };
 
 export async function leaveRTCSession(

src/widget.ts

@@ -17,10 +17,11 @@ import { getUrlParams } from "./UrlParams";
 import { Config } from "./config/Config";
 import { ElementCallReactionEventType } from "./reactions";
 
-// Subset of the actions in matrix-react-sdk
+// Subset of the actions in element-web
 export enum ElementWidgetActions {
   JoinCall = "io.element.join",
   HangupCall = "im.vector.hangup",
+  Close = "io.element.close",
   TileLayout = "io.element.tile_layout",
   SpotlightLayout = "io.element.spotlight_layout",
   // This can be sent as from or to widget