fix: Windows audio mute fix

electron/window/create-window.ts

@@ -210,6 +210,39 @@ export async function createWindow(): Promise<void> {
     );
   }
 
+  if (process.platform === 'win32') {
+    session.defaultSession.setDisplayMediaRequestHandler(
+      async (request, respond) => {
+        // On Windows the system picker (useSystemPicker: true) is preferred.
+        // This handler is only reached when the system picker is unavailable.
+        // Include loopback audio when the renderer requested it so that
+        // getDisplayMedia receives an audio track and the renderer-side
+        // restrictOwnAudio constraint can keep the app's own voice playback
+        // out of the captured stream.
+        try {
+          const sources = await desktopCapturer.getSources({
+            types: ['window', 'screen'],
+            thumbnailSize: { width: 150, height: 150 }
+          });
+          const firstSource = sources[0];
+
+          if (firstSource) {
+            respond({
+              video: firstSource,
+              ...(request.audioRequested ? { audio: 'loopback' } : {})
+            });
+            return;
+          }
+        } catch {
+          // desktopCapturer also unavailable
+        }
+
+        respond({});
+      },
+      { useSystemPicker: true }
+    );
+  }
+
   if (process.env['NODE_ENV'] === 'development') {
     const devUrl = process.env['SSL'] === 'true'
       ? 'https://localhost:4200'

toju-app/src/app/infrastructure/realtime/media/screen-share-platforms/desktop-electron-screen-share.capture.ts

@@ -49,9 +49,19 @@ export class DesktopElectronScreenShareCapture {
 
     const sources = await electronApi.getSources();
     const selection = await this.resolveSourceSelection(sources, options.includeSystemAudio);
+
+    // On Windows, electron-desktop loopback audio captures all system output
+    // including the app's voice playback, creating echo for watchers or
+    // requiring total voice muting for the sharer. The getDisplayMedia path
+    // handles this correctly via restrictOwnAudio — if we fell back here,
+    // share video only so voice chat stays functional.
+    const effectiveIncludeSystemAudio = this.isWindowsElectron()
+      ? false
+      : selection.includeSystemAudio;
+
     const captureOptions = {
       ...options,
-      includeSystemAudio: selection.includeSystemAudio
+      includeSystemAudio: effectiveIncludeSystemAudio
     };
 
     if (!selection.source) {
@@ -59,7 +69,7 @@ export class DesktopElectronScreenShareCapture {
     }
 
     this.logger.info('Selected Electron desktop source', {
-      includeSystemAudio: selection.includeSystemAudio,
+      includeSystemAudio: effectiveIncludeSystemAudio,
       sourceId: selection.source.id,
       sourceName: selection.source.name
     });
@@ -73,7 +83,7 @@ export class DesktopElectronScreenShareCapture {
     }
 
     return {
-      includeSystemAudio: selection.includeSystemAudio,
+      includeSystemAudio: effectiveIncludeSystemAudio,
       stream: await navigator.mediaDevices.getUserMedia(constraints)
     };
   }