Bug 448558

Summary:	[Wayland] Changing primary display swaps panels on that display
Product:	[Applications] systemsettings	Reporter:	indecisiveautomator
Component:	kcm_kscreen	Assignee:	kscreen-bugs-null <kscreen-bugs-null>
Status:	RESOLVED INTENTIONAL
Severity:	normal	CC:	kde, plasma-bugs-null
Priority:	NOR
Version First Reported In:	5.23.90
Target Milestone:	---
Platform:	Arch Linux
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:

Description indecisiveautomator 2022-01-15 22:06:39 UTC

SUMMARY
Changing primary display moves the panels on those displays. For example if we have Screen 1 and Screen 2. On login, Screen 2 is set to the primary display. Changing Screen 1 to the primary display will swap the panels on these screens.


STEPS TO REPRODUCE
Changing the primary display and the panels will be swapped. 


OBSERVED RESULT
Changing which display is set as the Primary display will cause the panels to be swapped.

A semi-unrelated side note: If the panel is being swapped from a non-scaled display to a scaled display, the icons will also appear blurry. Hovering over them resolves this. 


EXPECTED RESULT
Settings primary output will not affect panel setup.


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
This bug is particularly a pain because dragging panels too quickly between displays causes a crash. This is a separate bug that I believe is already being tracked, but I wanted to mention a more critical reason as to why just swapping the panels is a real headache.

Comment 1 indecisiveautomator 2022-01-15 22:54:31 UTC

This seems to also swap the wallpapers between the displays.

Comment 2 David Edmundson 2022-01-16 22:58:32 UTC

>Changing which display is set as the Primary display will cause the panels to be swapped.

Yes. That's the primary purpose of the primary display flag. 
Why else are you setting it?

Comment 3 indecisiveautomator 2022-01-17 00:54:17 UTC

I assumed the purpose of a primary display was to have things like game windows open on that display primarily, as well as notification bubbles, and things like KRunner and Application Dashboard appearing on that display. Those are my own personal expectations of what a primary display flag would do, I would not have expected it to change the setup of my panels or wallpapers.