https://bugs.kde.org/show_bug.cgi?id=439428
Bug ID: 439428
Summary: Vertically maximized windows reopen with 1 pixel gap
when scaling set
Product: kwin
Version: 5.21.4
Platform: Kubuntu Packages
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: kwin-bugs-n...@kde.org
Reporter: b...@twosixfour.net
Target Milestone: ---
Created attachment 139815
--> https://bugs.kde.org/attachment.cgi?id=139815&action=edit
Vertically "maximized" Kate window with 1 pixel gap at bottom.
SUMMARY
Using X11, if a window or application is set to vertically maximize, when
reopened it will have a 1 pixel vertical gap between it an the edges of the
screen (i.e., its vertical height will be 1 pixel less than it should be).
STEPS TO REPRODUCE
1. Set Global Scale to >175% or above.
2. Open a window that should be vertically maximized (but not fully
horizontally).
OBSERVED RESULT
Window will not be fully vertically maximized, and a gap of 1 pixel will be
visible.
EXPECTED RESULT
No gap should be visible.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Kubuntu 21.04
(available in About System)
KDE Plasma Version: 5.21.4
KDE Frameworks Version: 5.80.0
Qt Version: 5.15.2
ADDITIONAL INFORMATION
This is obvious when a window is tiled to one size of the screen, then
reopened. It also occurs even if a window rule is set to make the window
maximized vertically initially, thus ignoring that setting. If a rule forces
the window to be that size at all times, it does obey the rule (but then, of
course, the user can't manually resize it to anything else).
Sometimes the gap appears at the top, sometimes the bottom. The gap appears
when using a plasma panel, a latte panel, or no panel at all.
This does not occur if a window is fully maximized (those will reopen fully
maximized both vertically and horizontally) nor windows just set to be
maximized horizontally.
In my testing it seems that this only happens when the global scale in the
display settings is set to 175% or more (no gap appears at 100% to 150%).
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