https://bugs.kde.org/show_bug.cgi?id=464842
Bug ID: 464842
Summary: Maximized windows on one screen take one pixel on
other (fractional scaling)
Classification: Plasma
Product: kwin
Version: 5.26.90
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: wayland-generic
Assignee: kwin-bugs-n...@kde.org
Reporter: w01dn...@gmail.com
Target Milestone: ---
Created attachment 155655
--> https://bugs.kde.org/attachment.cgi?id=155655&action=edit
Affected 1.25 + 1.5 screen layout
SUMMARY
With kwin_wayland 5.26.90 (bug wasn't present on kwin_wayland 5.26.5) maximized
windows take also one pixel on other screen. I use fractional scaling,
top-bottom screen arrangements (left-right wasn't tested). Bug reproduced with
top×1.25 + bottom×1.5 and top×1 + bottom×1.5 screen layouts. One extra pixel is
not kscreen problem, screens do not overlap (it is hidden by right panel on
bottom screen and active maximized window on bottom screen).
STEPS TO REPRODUCE
1. Setup layout with two screens, bottom one has scaling 1.5, top could be any
(reproduced at least with 1 and 1.25).
2. Maximize window on top screen (for easier noticing, contrast window and
wallpaper may be used).
3. (Optional) Maximize some window on bottom screen.
OBSERVED RESULT
One pixel line overhang on on bottom screen from top max window.
With step 3 you could switch between windows and see how that extra line
appears and hides.
EXPECTED RESULT
Maximized windows should not extend beyond their screen.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: openSUSE Tumbleweed 20230124 with KDE Plasma 5.27 beta
KDE Plasma Version: 5.26.90
KDE Frameworks Version: 5.102.0
Qt Version: 5.15.8+kde160
ADDITIONAL INFORMATION
This bug looks like some sort of opposite to
https://bugs.kde.org/show_bug.cgi?id=459373
Unlike that bug it doesn't depend on XWayland (native Wayland clients are used)
and it wasn't present before 5.27 beta.
example of affected layout (full in attachment)
`kscreen-doctor -j | jq '[.outputs[] | { name: .name, pos: .pos, size: .size,
scale: .scale }]'`
```
[
{
"name": "eDP-1",
"pos": {
"x": 385,
"y": 1152
},
"size": {
"height": 1080,
"width": 1920
},
"scale": 1.5
},
{
"name": "DP-1",
"pos": {
"x": 0,
"y": 0
},
"size": {
"height": 1440,
"width": 2560
},
"scale": 1.25
}
]
```
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