Bug 516011

Summary:	Flickering when hovering over text with a transparent title bar
Product:	[Plasma] kwin	Reporter:	Piotr Mierzwinski <piotr.mierzwinski>
Component:	decorations	Assignee:	KWin default assignee <kwin-bugs-null>
Status:	REPORTED ---
Severity:	normal
Priority:	NOR
Version First Reported In:	6.6.0
Target Milestone:	---
Platform:	Neon
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:

Description Piotr Mierzwinski 2026-02-14 23:43:09 UTC

SUMMARY
Using "Window Decorations" theme with transparent title bar like: "Se7enAero" or "We10OS-dark", I experience very annoying flickering when it (title bar) is placed over any test (for example in web browser - I tested with Firefox and Kate), and it stops after couple seconds.
Please notice that when I minimize and restore any application and its titlebar is placed over text then I don't observe any flickering.

STEPS TO REPRODUCE
1. Open "System Setting -> Color & Themes -> Window Decorations"
2. Click "Get New.." button
3. Find one of mentioned themes, for example "We10OS-dark"
4. Apply it
5. Open Firefox with page where is a bit of text or Kate/KWrite and open any text document
6. Open Dolphin or any other application
7. Move Dolphin or any other application over Firefox or Kate/Kwrite like that title bar would be over displayed text in above application

OBSERVED RESULT
Flickering in title bar which stops after couple seconds.

EXPECTED RESULT
Transparency should work as expected

SOFTWARE/OS VERSIONS
KDE Plasma Version: 6.6.0
KDE Frameworks Version: 6.24.0
Qt Version: 6.10.2

ADDITIONAL INFORMATION
KDE Neon Testing