https://bugs.kde.org/show_bug.cgi?id=450350
--- Comment #1 from Holger ---
Today I found a new quality:
- I got a ballon-popup for some updates and clicked the button in there to open
discover
- I installed the updates (just some libraries, no reboot advised)
- on closing discover, I found the windows below staying darkened
Now, desktop 1 is mirrored as a darkened ghost on other desktops. If the window
in desktop 1 was in the foreground last, it will be drawn over the windows of
desktop 2.
By chance I had a LibreOffice Calc under the updates as the next window
grabbing the focus when the updates were done. So it is not necessarily
associated with Firefox. In Calc, when I now open the "Save as..." dialog, Calc
gets even darker. But the dialog and also the menus of Calc are fine.
In addition, on that first deskop in the background there was also a Firefox
window - one of multiple windows, while the other windows of the same Firefox
process are on different desktops and don't get darkened, that window on the
first desktop is also darkened. But what is really peculiar, if I open a tab
with youtube on desktop 1 in that affected window, the ghost as seen on desktop
2 will keep playing a live view of the video. I can even arrange the Calc and
the Firefox window side by side, so they both show as ghost on desktop 2 or any
other desktop.
Only all the windows that were at that moment on desktop1 leave a ghost. Moving
or opening a new window on desktop1, it does not get a ghost. So there are now
two independent ghost rectangles, that depending on order of last activation I
can lay over and under a third window on desktop 2.
OTH moving one of the darkened windows to the second desktop will now leave the
ghost immediately in place on desktop 1. Switching to desktop2 I can interact
with the still dark window and even move it back to desktop 1.
This time the ghosts are removed by deactivating and reactivating the effect:
"darken windows for system operation mode". I explicitly verified by deactiving
and reactivating the "darken parent" and the "darken inactive" effects first
without the ghost vanishing.
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