https://bugs.kde.org/show_bug.cgi?id=477886
Bug ID: 477886
Summary: Minimal Overlapping Window Placement Sometimes Places
windows between two monitors under fractional scaling
Classification: Plasma
Product: kwin
Version: git master
Platform: Other
OS: Linux
Status: REPORTED
Severity: minor
Priority: NOR
Component: general
Assignee: kwin-bugs-n...@kde.org
Reporter: fanzhuyi...@gmail.com
Target Milestone: ---
Created attachment 163740
--> https://bugs.kde.org/attachment.cgi?id=163740&action=edit
screenshot showing windows off by one pixel
SUMMARY
***
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***
STEPS TO REPRODUCE
1. Create a dual monitor setup with fractional scaling (e.g., see output of
kscreen-doctor -o below). The two monitors should be placed horizontally
2. Set Window Placement to Minimal Overlapping
3. Open a bunch of windows on the monitor on the left (e.g. in my setup, I ran
seq 1 5 | xargs -I{} bash -c "xclock -geometry 800x1000 &")
kscreen-doctor -o:
Output: 1 eDP-2
enabled
connected
priority 1
Panel
Modes: 0:2560x1600@240*! 1:2560x1600@60 2:1600x1200@60
3:1280x1024@60 4:1024x768@60 5:2560x1600@60 6:1920x1200@60 7:1280x800@60
8:2560x1440@60 9:1920x1080@60 10:1600x900@60 11:1368x768@60 12:1280x720@60
Geometry: 1920,0 1707x1067
Scale: 1.5
Rotation: 1
Overscan: 0
Vrr: Automatic
RgbRange: Automatic
HDR: incapable
Wide Color Gamut: incapable
ICC profile: none
Output: 2 HDMI-A-1
enabled
connected
priority 2
HDMI
Modes: 0:1920x1080@60*! 1:1920x1080@72 2:1920x1080@60
3:1920x1080@50 4:1680x1050@60 5:1600x900@60 6:1280x1024@60 7:1440x900@60
8:1280x800@60 9:1280x720@60 10:1280x720@60 11:1280x720@50 12:1024x768@70
13:1024x768@60 14:800x600@72 15:800x600@60 16:800x600@56 17:720x576@50
18:720x480@60 19:640x480@73 20:640x480@60
Geometry: 0,0 1920x1080
Scale: 1
Rotation: 1
Overscan: 0
Vrr: incapable
RgbRange: unknown
HDR: incapable
Wide Color Gamut: incapable
ICC profile: none
OBSERVED RESULT
1. Notice that some windows have one pixel on the screen on the right
2. Toggle "Present Windows", and notice that the windows with one pixel on the
other monitor show up on both desktops.
EXPECTED RESULT
1. All windows should fully reside in the desktop opening them.
SOFTWARE/OS VERSIONS
Operating System: Arch Linux
KDE Plasma Version: 5.90.0
KDE Frameworks Version: 5.246.0
Qt Version: 6.6.1
Kernel Version: 6.6.3-arch1-1 (64-bit)
Graphics Platform: Wayland
Processors: 20 × 13th Gen Intel® Core™ i9-13900H
Memory: 15.2 GiB of RAM
Graphics Processor: Mesa Intel® Graphics
Manufacturer: ASUSTeK COMPUTER INC.
Product Name: ROG Zephyrus G16 GU603VV_GU603VV
System Version: 1.0
ADDITIONAL INFORMATION
This is exactly the same issue that commit 5502ce9 [1] was supposed to solve.
But it still happens in setups with fractional scaling.
The cause is probably mixing ints and qreals in the calculations.
[1]
https://invent.kde.org/plasma/kwin/-/commit/5502ce9a9c0420bc4e12c4e224b926020a2e1170
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