Bug 429524

Summary:	The title bar of maximized windows is not blurred when using a transparent color scheme and blur enabled theme
Product:	[Plasma] kwin	Reporter:	Alessandro Astone <ales.astone>
Component:	decorations	Assignee:	KWin default assignee <kwin-bugs-null>
Status:	RESOLVED UNMAINTAINED
Severity:	normal	CC:	nate, tromzy
Priority:	NOR
Version First Reported In:	5.20.3
Target Milestone:	---
Platform:	Fedora RPMs
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:

Description Alessandro Astone 2020-11-22 21:45:32 UTC

SUMMARY
When using the below described way of creating a blurred title bar, the blur effect is not applied to maximized windows.

STEPS TO REPRODUCE
0. Enable Blur in Desktop Effects
1. git clone https://github.com/KDE/breeze
2. cd breeze
3. wget https://gist.githubusercontent.com/aleasto/0d340bdba930ccc91be52c1e9039a3ed/raw/breeze-example.diff
3. git apply breeze-example.diff
4. [build and apply the theme in Window Decorations and Colors]

OBSERVED RESULT
Observe that, for example, Dolphin's title bar is translucent and blurred.
However, upon maximizing the window the blur effect disappears, and the title bar is now only semi-transparent.

EXPECTED RESULT
The title bar should be blurred even when the window is maximized

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: Fedora 33
(available in About System)
KDE Plasma Version: 5.20.3
KDE Frameworks Version: 5.75.0
Qt Version: 5.15.1

ADDITIONAL INFORMATION
If needed, I'm on: X11, proprietary nvidia

Comment 1 tromzy 2021-05-05 09:12:00 UTC

I can confirm this behaviour on Plasma 5.21.5 on Wayland (not tested on X11), with the Lightly window theme. Maximized windows don't get blurred titlebars, but unmaximized ones do.

Comment 2 David Edmundson 2023-09-06 10:38:42 UTC

This bug was reported against an outdated version of KWin. We have made many changes since the. 
If the issue persists in newer versions can you reopen the bug report updating the version number.