https://bugs.kde.org/show_bug.cgi?id=468184
Bug ID: 468184
Summary: Kwin moving windows and resizing them very poorly to
unusable states on multi-monitor setups during unplug
events
Classification: Plasma
Product: kwin
Version: 5.27.2
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: multi-screen
Assignee: kwin-bugs-n...@kde.org
Reporter: mich...@butash.net
Target Milestone: ---
SUMMARY
KDE in general has been bad at dealing with windows placements for some time
for me in using 4x displays is my normal, but every time geometry changes with
undocking (or a power hit/glitch simulating one), removing 3x displays then
moves windows and resizes them to unusable and unfindable widths, and never
restores them to proper placement/geometry upon restoration of desired kscreen
arrangement.
STEPS TO REPRODUCE
1. Configure 4x displays in extended mode right to left in a 15360x2160 display
set
2. Arrange various applications such as firefox, konsole, okular, steam,
keepassxc, libreoffice, and other applications across all 4 displays.
3. Disconnect the Thunderbolt 4 dock adding the 3x external ports/displays to
the unit
4. Watch KDE move windows the laptop display normally the far left-most
display, adjusting placement to the right left of the screen, and resizing them
horizontally to a much smaller with (5-100px wide), but not vertically.
5. Reconnect thunderbolt dock, observe KDE restore 3x additional displays and
arrangement.
6. Observe some of the moved windows are replaced back to their original
placement, but typically only a small subset
7. Observe others are left on the far left-most laptop display with poorly
resized horizontal pixel width
OBSERVED RESULT
Using 4x displays, 1x built-in on a laptop, and 3x external connected to a
Thunderbolt 4 dock, when dock is disconnected, kwin shuffles applications to
the remaining laptop display, but in doing so commonly will mangle horizontal
window geometry of most, but not all open applications, and often overlap them
very non-optimal ways.
Once the dock is reconnected/restored, kscreen restores the display
arrangement, but kwin is not restoring all the windows to their proper
placement or geometry. Even stranger is it's almost random where it moves
things each time, when it happens moving things small and small widths when
resizing, and moving some displays half off different parts of the screens.
Seeing as this can happen at times several times a day, shuffling my
applications about each time, resizing them so small horizontally even finding
them on a tiny 15" laptop displays is extremely difficult where the 3x other
displays are 50" TV's. Even stranger is it gets incrementally worse each time
it happens.
EXPECTED RESULT
At bare minimum, seeing these are all the same 3840x2160 displays, it should
have no reason to resize the horizontal widths between across different
resolutions, and once kscreen re-applies its given screen profile for the given
displays to restore geometry, those displays should be replaced across the
original set of displays.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Arch Linux, kernel 6.2.5-arch1-1
KDE Plasma Version: 5.27.2
KDE Frameworks Version: 5.103.0
Qt Version: 5.15.8
ADDITIONAL INFORMATION
This has been happening for some time across prior and new laptops for years
now commonly, where recently clearing kscreen, plasmascreenrc,
desktop-appletsrc files from home .config/.local files helped this this
initially, but each time is incrementally regressing worse in worse in
moving/resizing different apps in different places/sizes.
It seems if it needs to resize a window, it should never consider resizing a
something from 2000px wide to only 5px wide. As well, it would be nice if when
it does move all my windows to a single display to at least tile them in some
rough fashion vs. a dogpile into the left and bottom-most corner on the
display.
I have attempted to add using the kwin script "restoreToScreen" to help this,
but with or without doesn't seem to matter. Feedback on this script's github
is that kwin has taken this feature on, but seems to do so poorly with or
without the script. https://github.com/Hegemonia123/restoreToScreen/issues
I am unsure where to look for troubleshooting anything related windows
placement state tracking, but would happy to provide requested information.
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