Fix screenshare portals linux

electron/window/create-window.ts

@@ -1,6 +1,8 @@
 import {
   app,
   BrowserWindow,
+  desktopCapturer,
+  session,
   shell
 } from 'electron';
 import * as fs from 'fs';
@@ -61,6 +63,34 @@ export async function createWindow(): Promise<void> {
     }
   });
 
+  if (process.platform === 'linux') {
+    session.defaultSession.setDisplayMediaRequestHandler(
+      async (_request, respond) => {
+        // On Linux/Wayland the system picker (useSystemPicker: true) handles
+        // the portal. This handler is only reached if the system picker is
+        // unavailable (e.g. X11 without a portal). Fall back to
+        // desktopCapturer so the user still gets something.
+        try {
+          const sources = await desktopCapturer.getSources({
+            types: ['window', 'screen'],
+            thumbnailSize: { width: 150, height: 150 }
+          });
+          const firstSource = sources[0];
+
+          if (firstSource) {
+            respond({ video: firstSource });
+            return;
+          }
+        } catch {
+          // desktopCapturer also unavailable
+        }
+
+        respond({});
+      },
+      { useSystemPicker: true }
+    );
+  }
+
   if (process.env['NODE_ENV'] === 'development') {
     const devUrl = process.env['SSL'] === 'true'
       ? 'https://localhost:4200'