https://bugs.kde.org/show_bug.cgi?id=491152
Bug ID: 491152
Summary: Windows should not snap to window edges that are
currently invisible
Classification: Plasma
Product: kwin
Version: 6.1.3
Platform: Arch Linux
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: core
Assignee: kwin-bugs-n...@kde.org
Reporter: adam.m.fontenot+...@gmail.com
Target Milestone: ---
Whenever I have a bunch of windows open, let's say 15+, trying to drag a window
around is a snapping nightmare where the window is constantly getting attached
to window edges that are buried 10 layers deep, e.g. under a maximized browser
window. Window snapping is crucial, I don't want to disable it, but this is a
real pain.
Sometimes, the bad snaps can interfere with the snap you *want*, making it
difficult or impossible to rearrange your windows.
This is ultimately a feature request, but I think it's a pretty obvious one and
I was surprised that I couldn't find an issue already reported for it.
SUMMARY
STEPS TO REPRODUCE
1. Open a ton of randomly placed small windows. 20 KWrite windows launched from
a terminal is a good way to test this.
2. Open a maximized window above all the other windows.
3. Move a non-maximized window around on top of the maximized window, and
observe the snapping behavior.
OBSERVED RESULT
Window gets snapped at random locations all over the place. The setting "Snap
windows: Only when overlapping" doesn't affect this (in fact, I don't know what
it does).
The issue feels more annoying as the resolution of your screen decreases,
because the snapping margin doesn't scale with the screen resolution. On a QHD
screen it's not too terrible, on FHD it's worse.
EXPECTED RESULT
Window does not get snapped anywhere, because there are no visible
non-maximized windows to snap to.
Operating System: Arch Linux
KDE Plasma Version: 6.1.3
KDE Frameworks Version: 6.4.0
Qt Version: 6.7.2
Kernel Version: 6.10.1-arch1-1 (64-bit)
Graphics Platform: Wayland
ADDITIONAL INFORMATION
This is potentially a tough ask, because the ideal implementation would
correctly deal with partially visible windows, and only snap if the *portion*
of the window that abuts the currently being moved window is at least partially
visible, regardless of whether other parts of the window are visible or not.
I think a reasonable starting point that is hopefully easy to implement would
be to not ignore windows as snapping targets if they are entirely invisible. A
slight step up from that might be to ignore window edges that are entirely
invisible, if that could be implemented reasonably.
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