https://bugs.kde.org/show_bug.cgi?id=448792
Bug ID: 448792
Summary: [Wayland] When dragging a window roughly halfway over
on a scaled display to a non-scaled display, the
window will appear blurry on the scaled display
Product: plasmashell
Version: 5.23.90
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: Multi-screen support
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Target Milestone: 1.0
SUMMARY
When dragging a native Wayland window (Qt or GTK) between a scaled display and
a non-scaled display, (usually) once you drag it more than roughly halfway
across, the section on the scaled display will appear blurry as though the
resolution has gone down. The same is true in the reverse situation: When
dragging a window from a non-scaled display to a scaled display, it will appear
blurry on the scaled display until it is roughly halfway across. The window
appearance does not change at all on the non-scaled display in any of these
circumstances.
I say "usually" above as there is one application, the Strawberry music player,
that has different behaviour. When dragging *from* a scaled display, it will
appear blurry once it is more than halfway across. However it will not fix
itself until the window is dragged fully back across onto the scaled display.
Strawberry is a Qt6 application and I believe the only one I have to test, and
the only difference I can think of between it and the other Qt applications on
my system, so perhaps this is why it has different behaviour.
I have tested with several KDE applications such as Dolphin, System Settings
and Kate, as well as several GTK applications such as Chromium, Firefox and
Lutris. Xwayland applications appear blurry on scaled displays regardless.
When taking a screenshot of the windows, the resolution of the screenshot is
different when the window is sharp and when it is blurry. When taking a region
screenshot, once the window appears low resolution, a strange divide appears
where the scaled monitor ends (see screenshots in "Observed Result").
STEPS TO REPRODUCE
1. Drag a native Wayland application between a scaled and non-scaled display.
2. Once more than halfway:
2a. If dragging *from* a scaled display, the window will appear blurry when
dragged more than halfway across
2b. If dragging *to* a scaled display, the window will appear blurry until
dragged more than halfway across, where it will appear normal.
3. Appearance never changes on the regular, non-scaled display at any point.
OBSERVED RESULT
If dragged *from* a scaled display, the window will appear blurry when dragged
more than halfway onto the non-scaled display.
If dragged *to* a scaled display, a window will appear blurry until dragged
more than halfway onto the scaled display.
This is Lutris between my scaled display and a non-scaled display, where it
displays normally: https://i.imgur.com/2bkVsGU.png
This is Lutris when I move it too far across between the displays, and it
begins to appear blurry: https://i.imgur.com/Y49fh0V.png
EXPECTED RESULT
Window appears identically when between mixed displays as it does when on a
single display.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: 5.16.0-arch1-1
KDE Plasma Version: 5.23.90
KDE Frameworks Version: 5.90.0
Qt Version: 5.15.2
ADDITIONAL INFORMATION
- Visual issue with the screenshot is reproducible with all screenshots I take
using Spectacle under the same circumstances.
- Windows appear fine between non-scaled displays.
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