Created attachment 140247 [details]
muti-monitor screenshot of the logout prompt with mouse over on the non-focused screen

SUMMARY
When the logout prompt is invoked on a multi monitor system, there is an individual logout prompt per screen. Each screen has its own state w.r.t. its selection. This is very inconvenient, since there is not use case to that, but one first needs to find the active screen in order to navigate with the keyboard to the desired selection. The active screen is very hard to find, since the only indicator is the highlighting effect of the currently selected option. It is possible to alt-tab between the multiple logout prompts on different screens selecting different options. Furthermore the mouse over might highlight an option on the non-focused screen, making it very hard to guess which option is triggered when pressing enter. 


STEPS TO REPRODUCE
1. Have a multi monitor system
2. press shutdown / logout / etc in the application launcher
3. navigate left / right with the keyboard to select another option in the logout prompt

OBSERVED RESULT
selection is changed on a single screen only. highlighting is only present on a single screen.


EXPECTED RESULT
selection is changed on all screens, highlighting is visible on all screens.


SOFTWARE/OS VERSIONS
Operating System: Gentoo Linux
KDE Plasma Version: 5.22.3
KDE Frameworks Version: 5.84.0
Qt Version: 5.15.2
Kernel Version: 5.12.19-gentoo (64-bit)
Graphics Platform: X11
Processors: 8 × Intel® Core™ i7-4810MQ CPU @ 2.80GHz
Memory: 15.5 GiB of RAM
Graphics Processor: Mesa DRI Intel® HD Graphics 4600