The window title blinks when opening context menus

[dalexeev]

Godot version:
4.0.dev.calinou.fafb0ba06

OS/device including version:
Kubuntu 19.10, KDE Plasma 5.16.5

Issue description:
The main window becomes inactive when a context menu (not a dialog box) is opened. This is a bit annoying.

Steps to reproduce:

Minimal reproduction project:
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[Calinou]

This is because context menus are opened in new windows. Can anything be done about this, or should we make context menus part of the main window again? (This would make it no longer possible to have context menus that overflow the main window.)

[dalexeev]

I think we should try to get the same behavior as in other programs.

[mhilbrunner]

This may be a duplicate of #37531

[dalexeev]

This may be a duplicate of #37531

Yes, that is right. I reported exactly the same thing, but in other words. Sorry.