message: Electron 466: fix setting user data path using command line
  fix setting customer user config directory
  add code comments
  allow custom user data path to contain character "="
diff: @@ -228,6 +228,16 @@ function setupThenOpenMainWindow() {
  isAppAlreadyOpen = true;
  getUrlAndCreateMainWindow();
  + // Allows a developer to set custom user data path from command line when
  + // launching the app. Mostly used for running automation tests with
  + // multiple instances
  + let customDataArg = getCmdLineArg(process.argv, '--userDataPath=', false);
  + let customDataFolder = customDataArg.substring(customDataArg.indexOf('=') + 1);
  +
  + if (customDataArg && customDataFolder) {
  + app.setPath('userData', customDataFolder);
  + }
  +
  // Event that fixes the remote desktop issue in Windows
  // by repositioning the browser window
  electron.screen.on('display-removed', windowMgr.verifyDisplays);
  