https://bugs.kde.org/show_bug.cgi?id=483936
Bug ID: 483936
Summary: Program stuck in preview mode and displayed over
others after closing different program through Task
Switcher
Classification: Plasma
Product: kwin
Version: 6.0.2
Platform: Arch Linux
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: tabbox
Assignee: kwin-bugs-n...@kde.org
Reporter: fi...@tutanota.com
Target Milestone: ---
Created attachment 167427
--> https://bugs.kde.org/attachment.cgi?id=167427&action=edit
Program is drawn over everything
SUMMARY
Closing a program from Task Switcher shown with Alt+Tab will display a program
behind the switcher which does not have focus but is drawn in front of
everything else regardless. A different program will be highlighted on the Task
Switcher itself and that program will actually have focus (i.e. it receives
mouse clicks even if it's not visible). The program displayed over others is
"stuck" like this until you switch to the program displayed on screen with Task
Switcher, or interact with the titlebar when there is only empty desktop behind
the titlebar.
STEPS TO REPRODUCE
1. Open a few programs.
2. Alt+Tab to open Task Switcher
3. Close a program by clicking its (X) in Task Switcher
OBSERVED RESULT
Behind the Task Switcher, the program shown ("program 4" in video) will be
different to the one highlighted in Task Switcher itself ("program 2"). I'm not
certain what logic is choosing the program to display on screen, but I think
it's always the wrong one compared to what Task Switcher shows.
Exiting Task Switcher (releasing Alt+Tab) will show program 4 without focus but
drawn in front of other programs, and program 2 will have focus.
If the programs aren't maximised, you CAN move the program drawn at the front
by clicking on the titlebar PROVIDED there is no window below the program drawn
at the front, i.e. if there's desktop background behind the titlebar then it
receives the mouse clicks. Otherwise, when program 4 is over other programs,
using the mouse over program 4 goes through it and to the programs behind it
(focused or not).
Task Switcher can switch between programs fine, but program 1 stays in front
even if a different program is focused by Task Switcher. When you switch to
program 4, it regains focus and behaves like normal. After this, switching to a
different program works as expected and program 4 no longer stays in front of
other programs.
ADDITIONAL INFORMATION
I think the issue occurs when the last focused window is the one you're
closing. With focus on program 3, Alt+Tab for Task Switcher previews program 4
but doesn't commit to focusing i until Alt+Tab is released (I think). So in our
case, program 3 is not focused any more, program 4 is preview focused; then
program 3 is closed through the Task Switcher (X) and perhaps program 4 just
gets stuck in the preview focus view?
SOFTWARE/OS VERSIONS
Operating System: Arch Linux
KDE Plasma Version: 6.0.2
KDE Frameworks Version: 6.0.0
Qt Version: 6.6.2
Kernel Version: 6.8.1-arch1-1 (64-bit)
Graphics Platform: Wayland
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