Memory leak issue when multiple windows are used.

[lovemegowin]

Hi, I discovered a scenario of memory leak that can be reproduced 100% of the time when using multiple windows.

When a user creates a new window and closes it, this object will not be released.
Based on my preliminary investigation, The line code won't be executable , because when the events 'closed' trigger, the win.isDestroyed() will always return true

I have create a minimum reproducible repo https://github.com/lovemegowin/electron-context-menu-memory-leak-sample