Allow to prevent automatic opening of menu on right click

[felipecrs]

This library is really great. I used it to build my first Rust application:

• https://github.com/felipecrs/volume-locker

However, in my application, the menu items are dynamic and can change over time. Instead of updating these items in the background, I update them whenever the user right-clicks the tray icon.

Although the update happens very fast, the menu item flashes/flicks because it has to be re-rendered after being updated.

There's a demo video in my application README which you can see this.

It would be great if I could prevent the automatic opening of the menu on right-click, so that I can open it by myself once I am done with updating the menu items.