Created attachment 118442 [details]
STEPS TO REPRODUCE
1. Set 1.2 as display scaling factor in system settings > display and monitor and restart plasma
2. search for "task switcher" in the apps launcher and open it
3. under 'Visualization", select any option listed in the dropdown and click preview button
Preview looks broken, it's not completely filled, one piece is transparent.
The screenshots explains better.
previews are shown correctly.
Operating System: Arch Linux
KDE Plasma Version: 5.15.2
KDE Frameworks Version: 5.55.0
Qt Version: 5.12.1
Created attachment 118443 [details]
Hmm, it looks like provided blur/contrast region is not scaled. Though I personally can't reproduce this bug.
Git commit abcf323ab6f343171308231d6d40f65cb2409502 by David Edmundson.
Committed on 06/03/2019 at 21:42.
Pushed by davidedmundson into branch 'master'.
Send blur/background contrast in device pixels
A Qt app using Qt scaling will only know the position of windows and all
geometry in logical pixels. Kwin needs everything in device pixels.
This hasn't been a big issue till now as plasma on X doesn't opt in for
Qt scaling. For wayland everything is in the same sane coordinate space.
It can occur in some previews in systemsettings and at some point maybe plasma should use
Qt scaling on X
Task switcher now blurred the whole area.
Ran plamsa on X with plasma_use_qt_scaling. Kickoff was less corrupted.
Differential Revision: https://phabricator.kde.org/D19544
M +2 -2 src/kwindoweffects.h
M +6 -2 src/platforms/xcb/kwindoweffects.cpp