Bug 514639

Summary:	Firefox PIP window freezes when resizing
Product:	[Plasma] kwin	Reporter:	Paragoumba <kde.fossil822>
Component:	xwayland	Assignee:	KWin default assignee <kwin-bugs-null>
Status:	NEEDSINFO WAITINGFORINFO
Severity:	normal
Priority:	NOR
Version First Reported In:	6.4.5
Target Milestone:	---
Platform:	Other
OS:	Other
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:

Description Paragoumba 2026-01-15 10:01:12 UTC

SUMMARY
The PiP window freezes when resizing it

STEPS TO REPRODUCE
1. Start firefox with xwayland
2. Go to any website with a video player
3. Pop up the video, with the PiP button on the right of the player
4. Try to resize the PiP window with one of the corners

OBSERVED RESULT
The window freezes for a few seconds and doesn't resize

EXPECTED RESULT
The resize should be smooth while the video is playing 

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Fedora 43
KDE Plasma Version: 6.5.4
KDE Frameworks Version: 6.22.0
Qt Version: 6.10.1

ADDITIONAL INFORMATION
I can reproduce this bug on ArchLinux, Fedora 43 and Alma 10 with Plasma 6.4.5 running Firefox on XWayland. It might also happen on Wayland without the new PiP protocol
It doesn't happen on Alma 9 with Plasma 5.27
I am pretty sure it is a KDE bug rather than a Firefox one as I couldn't reproduce on Gnome and it also happens with Firefox ESR

Comment 1 Vlad Zahorodnii 2026-01-15 13:50:34 UTC

Does it happen in 6.5?

Comment 2 Paragoumba 2026-01-15 19:49:04 UTC

(In reply to Vlad Zahorodnii from comment #1)
> Does it happen in 6.5?

It does happen on 6.5.5 with XWayland

Comment 3 Paragoumba 2026-01-15 20:01:51 UTC

And on 6.5.90