Bug 471842

Summary:	Multiple XWayland-using Firefox windows from different browser profiles are not identified by the tabbox as belonging to the same parent app
Product:	[Plasma] kwin	Reporter:	Nate Graham <nate>
Component:	tabbox	Assignee:	KWin default assignee <kwin-bugs-null>
Status:	CONFIRMED ---
Severity:	normal	Keywords:	wayland-only
Priority:	NOR
Version First Reported In:	master
Target Milestone:	---
Platform:	Other
OS:	Linux
Latest Commit:		Version Fixed In:
Sentry Crash Report:

Description Nate Graham 2023-07-01 18:14:12 UTC

STEPS TO REPRODUCE
1. Use Firefox 114
2. Set up multiple profiles
3. Load two profiles, each in a separate window
4. Hit Alt+Tilde on the keyboard


OBSERVED RESULT
The tabbox appears with only one window in it, as though KWin can't detect that the two Firefox windows are both instances of the same app


EXPECTED RESULT
Two windows appear in the Alt+Tilde tabbox, one per Firefox window


SOFTWARE/OS VERSIONS
Operating System: Fedora Linux 38
KDE Plasma Version: 5.27.80
KDE Frameworks Version: 5.240.0
Qt Version: 6.5.1
Kernel Version: 6.3.8-200.fc38.x86_64 (64-bit)
Graphics Platform: wayland
Processors: 8 × Intel® Core™ i7-10510U CPU @ 1.80GHz
Memory: 15.2 GiB of RAM
Graphics Processor: Mesa Intel® UHD Graphics


ADDITIONAL INFORMATION
- Does not occur if you just make a regular new window in Firefox with Ctrl+N
- Does not occur with other multi-window apps like Dolphin
- The Task Manager widget can correctly group the two windows from multiple Firefox profiles

I'm pretty sure this didn't happen before, but I haven't isolated it to a particular version of Firefox or a KWin change.

Comment 1 Nate Graham 2023-07-01 18:57:57 UTC

Ah I found the trigger: this only happens when Firefox is running in XWayland mode. Running it in native Wayland mode resolves the issue and lets KWin identify both windows as belonging to the same app. The trigger for that happening was something unrelated in distro packaging.