https://bugs.kde.org/show_bug.cgi?id=460398
Bug ID: 460398
Summary: When display scale changes, all position and size
rules need to be changed manually
Classification: Applications
Product: systemsettings
Version: git-stable-Plasma/5.26
Platform: Archlinux
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: kcm_kwinrules
Assignee: kwin-bugs-n...@kde.org
Reporter: gudvinr+...@gmail.com
CC: isma...@gmail.com, plasma-b...@kde.org
Target Milestone: ---
SUMMARY
If you have rules that change position and/or size and then change scale,
display starts being smaller/bigger virtually and thus old values do not work
anymore.
I personally have quite a bit of those rules to position media players, etc on
different screens so it means I need to change each one individually. And if
you change scale in the future it should be done again.
Also after changing display style of screen coordinates from newX x newY to
oldX x oldY@scale it is now impossible to know what your real resolution even
is, so you need to open calculator and do that yourself which is rather
inconvenient.
STEPS TO REPRODUCE
1. Create window rule that places window at some positions other than 0x0 in
virtual screen space
2. Open window that you created rule for and confirm its position in physical
space on monitor
3. Close window
4. Change display scale in display configuration
5. Open same window again
OBSERVED RESULT
Display will be placed using same pixel coordinates which are not in the same
physical position on screen.
EXPECTED RESULT
Position from rules uses scale factors to calculate position and size for
windows.
SOFTWARE/OS VERSIONS
Operating System: Arch Linux
KDE Plasma Version: 5.26.0
KDE Frameworks Version: 5.99.0
Qt Version: 5.15.6
Kernel Version: 6.0.1-zen1-1-zen (64-bit)
Graphics Platform: Wayland
ADDITIONAL INFORMATION
There will be complications caused by use of multiple displays.
For example, if you have 2 displays, one of which is 1000x500 and another one
is 500x1000 and you apply scale 150% for the first and 125% for second one,
then window placed at 1250x0 in pixel coordinates should be located at 866x0
in virtual screen space (1000*100/150 + 250*100/125) if my calculations are
correct.
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