Bug 422463

SUMMARY
I have multi monitors configuration. Actually there are two displays. Main monitor and projector, which is positioned in "Display Configuration" at right side of monitor. Monitor has resolution 2560x1440 and projector has 1920x1080. Plasma session is running in X-Server.

The issue is that, when I move mouse cursor into right top corner of my monitor happens nothing. Just assigned action doesn't work. Only to activate this action I need to move mouse cursor into right top corner of second display so screen of projector. In my opinion this is not intuitive. I work on main monitor and would like to get action in right top corner this display. Please notice that left top corner works well. BTW. Mouse cursor doesn't move on second screen after I move it into right top corner, because monitor has greater resolution than positioned at right side screen of projector.

Additional problem is that, my projector is usually turned off or actually working in standby mode. I turn on it occasionally. Please notice even projector is turned off, but connected to my PC kwin/plasma sees it as normal display and even I switching my virtual desktops (I have 2) I can see it through split of second. I can move mouse cursor on this not visible desktop, I can move any window on it and sometime even some applications displays its window on this invisible screen. To be honest this is very annoying experience, because I have to choices in this moment. Either I can blindly catch window (holding left Alt) or just turn on projector and normally move window back to main monitor. Option to move window between displays is not available in task icon this window.

I'n not sure if described here issue is that kwin/plasma gets incorrectly provided information about screen from xorg sever or the issue is somewhere in kwin/plasma.
I didn't test this in Wayland session.

STEPS TO REPRODUCE
1. to your PC connect any display and let kwin/Plasma recognize it
2. In "Display Configuration" place it at right side of your main monitor
3. turn off connected monitor, let it be in standby mode
4. in "Screen Edges" configure any action for right corner - I have "Show windows from all desktops"
5. Move mouse cursor into top right corner your main monitor


OBSERVED RESULT
happens nothing or cursor moves on second display if it has smaller or equal resolution like main screen.

EXPECTED RESULT
assigned activity should be run

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: YES
(available in About System)
KDE Plasma Version: 5.18.5
KDE Frameworks Version: 5.70.0
Qt Version: 5.15

ADDITIONAL INFORMATION
In Windows 7 and Windows 10 I didn't observe such strange behavior - not visible desktop for second display what is turned off (works in standy mode) is just not achievable at all. Only when I turn on it is achievable.