Workaround Linux Wayland screenshare bug

app/main.ts

@@ -2630,13 +2630,16 @@ ipc.handle('show-save-dialog', async (_event, { defaultPath }) => {
   return { canceled: false, filePath: finalFilePath };
 });
 
-ipc.handle('getScreenCaptureSources', async () => {
-  return desktopCapturer.getSources({
-    fetchWindowIcons: true,
-    thumbnailSize: { height: 102, width: 184 },
-    types: ['window', 'screen'],
-  });
-});
+ipc.handle(
+  'getScreenCaptureSources',
+  async (_event, types: Array<'screen' | 'window'> = ['screen', 'window']) => {
+    return desktopCapturer.getSources({
+      fetchWindowIcons: true,
+      thumbnailSize: { height: 102, width: 184 },
+      types,
+    });
+  }
+);
 
 ipc.handle('executeMenuRole', async ({ sender }, untypedRole) => {
   const role = untypedRole as MenuItemConstructorOptions['role'];

ts/services/calling.ts

@@ -95,6 +95,7 @@ import {
 import { callingMessageToProto } from '../util/callingMessageToProto';
 import { getSendOptions } from '../util/getSendOptions';
 import { requestMicrophonePermissions } from '../util/requestMicrophonePermissions';
+import OS from '../util/os/osMain';
 import { SignalService as Proto } from '../protobuf';
 import dataInterface from '../sql/Client';
 import {
@@ -1329,8 +1330,20 @@ export class CallingClass {
   }
 
   async getPresentingSources(): Promise<Array<PresentableSource>> {
+    // There's a Linux Wayland Electron bug where requesting desktopCapturer.
+    // getSources() with types as ['screen', 'window'] (the default) pops 2
+    // OS permissions dialogs in an unusable state (Dialog 1 for Share Window
+    // is the foreground and ignores input; Dialog 2 for Share Screen is background
+    // and requires input. As a workaround, request both sources sequentially.
+    // https://github.com/signalapp/Signal-Desktop/issues/5350#issuecomment-1688614149
     const sources: ReadonlyArray<DesktopCapturerSource> =
-      await ipcRenderer.invoke('getScreenCaptureSources');
+      OS.isLinux() && OS.isWaylandEnabled()
+        ? (
+            await ipcRenderer.invoke('getScreenCaptureSources', ['screen'])
+          ).concat(
+            await ipcRenderer.invoke('getScreenCaptureSources', ['window'])
+          )
+        : await ipcRenderer.invoke('getScreenCaptureSources');
 
     const presentableSources: Array<PresentableSource> = [];
 

ts/util/os/osMain.ts

@@ -19,9 +19,14 @@ function getLinuxName(): string | undefined {
   return match[1];
 }
 
+function isWaylandEnabled(): boolean {
+  return Boolean(process.env.WAYLAND_DISPLAY);
+}
+
 const OS = {
   ...getOSFunctions(os.release()),
   getLinuxName,
+  isWaylandEnabled,
 };
 
 export default OS;