Bug 482788

Summary:	Panel alignment changes when moving custom-width centre
Product:	[Plasma] plasmashell	Reporter:	Jonas Verhofsté <jonas>
Component:	Panel	Assignee:	Plasma Bugs List <plasma-bugs-null>
Status:	RESOLVED INTENTIONAL
Severity:	normal	CC:	me, niccolo.venerandi, niccolo
Priority:	NOR	Keywords:	qt6
Version First Reported In:	6.0.1
Target Milestone:	1.0
Platform:	Arch Linux
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:
Attachments:	A centred, small-width panel The same panel, but its centre moved to the left

Description Jonas Verhofsté 2024-03-07 23:57:03 UTC

SUMMARY
When moving the centre of a custom-width panel, it's configured Alignment changes to "Left" or "Right", depending which side you move it to. In plasma 5 it was possible to have the centre of your panel not in the centre of your screen.

STEPS TO REPRODUCE
1. Create a new panel
2. Set Alignment to Centre
3. Set Width to Custom
4. Ensure the max width of the panel is smaller than the max width of the screen
5. Try to move the centre of the panel itself

OBSERVED RESULT
The Alignment of the panel changes, and with it also it's bounding box (max and min arrows).

EXPECTED RESULT
The Alignment should stay "Centre" and the panel centre itself should move, creating an off-centre centred panel.

SOFTWARE/OS VERSIONS
Linux: Arch Linux
(available in About System)
KDE Plasma Version: 6.0.1
KDE Frameworks Version: 6.0.0
Qt Version: 6.6.2

ADDITIONAL INFORMATION
Happens on both Wayland and X11

Comment 1 Jonas Verhofsté 2024-03-07 23:57:33 UTC

Created attachment 166653 [details]
A centred, small-width panel

Comment 2 Jonas Verhofsté 2024-03-07 23:57:58 UTC

Created attachment 166654 [details]
The same panel, but its centre moved to the left

Comment 3 Niccolò Venerandi 2024-03-08 19:49:55 UTC

This was actually an intentional change, though the reasoning behind it is quite technical (it was the only way to continue offer the feature when moving the panel to layer shell).

Comment 4 ratijas 2024-12-01 23:31:44 UTC

> it was the only way to continue offer the feature when moving the panel to layer shell

Are you saying that is it impossible for Wayland™ to have a centered window with an offset? And it was double-impossible to pad a window with a transparent area to imitate the offset?  Pardon me, but I kinda doubt it. Why was Plasma shell ported to some other shell that doesn't do things that Plasma is supposed to be able to?