IDLE submenu stays open if you switch windows

[StanFromIreland]

Bug report

Bug description:

The sub menu does not close automatically and when I switch windows with it open it stays on top of whatever window I've opened. The screenshot below shows the behavior.

Occurs in both 3.13 and main branch. Running Fedora 41 GNOME

CPython versions tested on:

CPython main branch

Operating systems tested on:

Linux

[terryjreedy]

Everything between 'behavior.' and 'Occurs in' is the included image. I don't see anything like this on Windows or macOS. The menu goes away when focus goes away, so is gone when returning focus to IDLE. So I am marking this as tkinter on Linux issue.