message: electron-135: added code comments
diff: @@ -355,6 +355,9 @@ function doCreateMainWindow(initialUrl, initialBounds) {
  });
  });
  + // In case we navigate to an external link from inside a pop-out,
  + // we open that link in an external browser rather than creating
  + // a new window
  browserWin.webContents.on('new-window', (childEvent, childWinUrl) => {
  childEvent.preventDefault();
  openUrlInDefaultBrower(childWinUrl);
  