Update to new electron single instance API

electron_app/src/electron-main.js

@@ -100,24 +100,12 @@ ipcMain.on('app_onAction', function(ev, payload) {
 
 app.commandLine.appendSwitch('--enable-usermedia-screen-capturing');
 
-const shouldQuit = app.makeSingleInstance((commandLine, workingDirectory) => {
- // If other instance launched with --hidden then skip showing window
- if (commandLine.includes('--hidden')) return;
-
- // Someone tried to run a second instance, we should focus our window.
- if (mainWindow) {
- if (!mainWindow.isVisible()) mainWindow.show();
- if (mainWindow.isMinimized()) mainWindow.restore();
- mainWindow.focus();
- }
-});
-
-if (shouldQuit) {
+const gotLock = app.requestSingleInstanceLock();
+if (!gotLock) {
  console.log('Other instance detected: exiting');
  app.exit();
 }
 
-
 const launcher = new AutoLaunch({
  name: vectorConfig.brand || 'Riot',
  isHidden: true,
@@ -268,6 +256,18 @@ app.on('before-quit', () => {
  }
 });
 
+app.on('second-instance', (ev, commandLine, workingDirectory) => {
+ // If other instance launched with --hidden then skip showing window
+ if (commandLine.includes('--hidden')) return;
+
+ // Someone tried to run a second instance, we should focus our window.
+ if (mainWindow) {
+ if (!mainWindow.isVisible()) mainWindow.show();
+ if (mainWindow.isMinimized()) mainWindow.restore();
+ mainWindow.focus();
+ }
+});
+
 // Set the App User Model ID to match what the squirrel
 // installer uses for the shortcut icon.
 // This makes notifications work on windows 8.1 (and is