Bug 466048

Summary:	[Regression] Bismuth tiling manager does not detect windows on Wayland
Product:	[Plasma] kwin	Reporter:	Anil <cd+kde>
Component:	wayland-generic	Assignee:	KWin default assignee <kwin-bugs-null>
Status:	RESOLVED DOWNSTREAM
Severity:	normal	CC:	kde, nate
Priority:	NOR	Keywords:	regression
Version First Reported In:	git master
Target Milestone:	---
Platform:	Arch Linux
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:

Description Anil 2023-02-19 03:24:19 UTC

SUMMARY
As of Plasma 5.27, the Bismuth Tiling addon (https://github.com/Bismuth-Forge/bismuth/issues/473)
does not detect windows properly on wayland.

It only sporadically detects when windows are opened, and it never detects when windows are closed. Therefore these windows don't get tiled.

Note that X11 still works properly

STEPS TO REPRODUCE
1. Tried on both 5.27 and git master
2. Install the KDE bismuth addon
3. Enable the addon in settings
4. Logout/login just to be safe
5. Open and close applications (such as dolphin, system settings etc).
OBSERVED RESULT
Bismuth does not detect the presence of the windows

EXPECTED RESULT
Windows are tiled or untiled as appropriate


SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: 
(available in About System)
KDE Plasma Version: 
KDE Frameworks Version: 
Qt Version: 

ADDITIONAL INFORMATION

Comment 1 David Edmundson 2023-02-19 22:47:22 UTC

Having read the upstream ticket:
 - it's not detecting the windows because it's hitting a try-catch fail *before* it binds to the other events of the window
 - hitting an error in a big try/catch block very strongly points to an error in the script itself 

Whilst clearly some behaviour change has happened in kwin, right now this looks to be on the bismuth side until something more specific is narrowed down. Please do update here if something more specific points to kwin.