Improve tray icon beahviour when clicked on it for the first time

I am really happy zim introduced the "zim --plugin trayicon" option to start the applicaion iconified on the tray bar. But I think it would be better if when the application starts the user clicks on the icon and the main window is showed. Instead now the current behaviour is that you have to click with the right mouse button on the icon and select "Notes". It isn't immediate. After this operation the app works as it should: when you click on the tray icon it shows the main window.

So what I would see in zim is the last behaviour as default also for the first left mouse button click.