https://bugs.kde.org/show_bug.cgi?id=361516
Bug ID: 361516
Summary: Panel on top/left cause a black window in cube
animation
Product: plasmashell
Version: 5.6.2
Platform: Archlinux Packages
URL: https://img.vim-cn.com/7e/641e2c7c1029938a70986843c8e0
0488610db8.ogv
OS: Linux
Status: UNCONFIRMED
Severity: normal
Priority: NOR
Component: Panel
Assignee: plasma-b...@kde.org
Reporter: farsee...@gmail.com
I reported this behavior first on the kwin side:
https://bugs.kde.org/show_bug.cgi?id=361511
During the investigation I suspect that the problem is on plasma's side.
I re-made a new screen record to illustrate this behavior:
https://img.vim-cn.com/7e/641e2c7c1029938a70986843c8e00488610db8.ogv
As we can see from the record, if I put a panel on the top or left side of the
screen, and active cube animation by switching virtual desktop, there is a
black window on the top right corner of the screen that is approximately 1/4
size of the screen.
By applying the cube animation to all the windows including the panels, the
problem is gone.
Following the suggestions in the above kwin's bug report, I tried to locate the
suspicious window.
This is the output of `xwininfo -root -tree`: http://cfp.vim-cn.com/ccyQ
We can see there is a window with size 640x480
0x1e00039 "Plasma": ("plasmashell" "plasmashell") 640x480+0+0 +0+0
I am not quite sure but I found this window on all my setups that have this
behavior.
And this is the `xwininfo -id 0x1e00039`: http://cfp.vim-cn.com/ccyR
This is the `xprop -id 0x1e00039`: http://cfp.vim-cn.com/ccyS
Reproducible: Always
Steps to Reproduce:
1. Select "Cube" Animation in system settings for switching virtual desktops
2. put the panel on the top side or left side of the screen
3. active cube animation by switching virtual desktop
Actual Results:
A black window is appearing on the top right corner of the screen during the
animation.
Expected Results:
Normal animation.
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