https://bugs.kde.org/show_bug.cgi?id=498235
Bug ID: 498235
Summary: Dragging a window offscreen can make it unrecoverable
Classification: Plasma
Product: kwin
Version: 6.2.4
Platform: NixOS
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: kwin-bugs-n...@kde.org
Reporter: ben.agaric+...@gmail.com
Target Milestone: ---
SUMMARY
It is possible for a window to become unretrievable from any screen. It can be
solected, pressing `ALT F3` brings up the window menu *from the bottom of the
screen* but saying to move it, maximize it, fullscreen it, you name it— the
window is never visible. The window stays missing from all screens and
activities.
STEPS TO REPRODUCE
1. This is a really weird one and i'm not sure how it happened so you get a
story, sorry. Using two external monitors and the laptop monitor. So i had
enabled the "Center snap zone" in Window Behavior because i was trying to see
if, whatever that was, maybe it [would give a way to reset an individual window
to snapping to one-half the screen
size](https://discuss.kde.org/t/how-do-i-force-meta-arrow-to-resize-window-50-of-screen-width/26171)
2. Step 1 may or may not be related to anything, but as part of trying to make
the "center snap zone" do anything at one point a dragged the window by its
title bar toward the bottom of the screen… and it disappeared.
3. When trying to reproduce this i had to drag several times to make it
disappear but it never disappeared as fully— i was able to drag it to another
monitor screen and start seeing it by using the toggle overview shortcut
(Meta+W) and dragging it. The original window that disappeared does not switch
monitors when dragged.
OBSERVED RESULT
The window can be seen in the overview or alt tab and its window menu can be
seen with ALT+F3 but the window itself cannot be made to be shown. Suddenly
realizing this is the same experience with the much more serious/reproducible
bug #479694
EXPECTED RESULT
There should be no way to drag a window entirely off-screen.
And if it is, moving the window, snapping the window, full-screening the
window… something makes it visible again.
SOFTWARE/OS VERSIONS
Operating System: NixOS 25.05
KDE Plasma Version: 6.2.4
KDE Frameworks Version: 6.9.0
Qt Version: 6.8.1
Kernel Version: 6.6.64 (64-bit)
Graphics Platform: Wayland
Processors: 16 × AMD Ryzen 9 7940HS w/ Radeon 780M Graphics
Memory: 92.1 GiB of RAM
Graphics Processor: AMD Radeon 780M
ADDITIONAL INFORMATION
I'm sorry. I hate to file this kind of super-hard-to-reproduce bug, but maybe
"simply" making it so windows cannot be entirely dragged offscreen no matter
how hard a fool like me might try will be enough to protect others from this.
Thanks!
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