Bug 415202 - kwin does not blur transparent GTK menus
Summary: kwin does not blur transparent GTK menus
Status: RESOLVED WORKSFORME
Alias: None
Product: kwin
Classification: Plasma
Component: compositing (show other bugs)
Version: 5.22.1
Platform: Other Linux
: NOR normal
Target Milestone: ---
Assignee: KWin default assignee
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2019-12-15 13:29 UTC by postix
Modified: 2023-04-11 12:53 UTC (History)
2 users (show)

See Also:
Latest Commit:
Version Fixed In:
Sentry Crash Report:

Attachments
Screenshot of the transparent GIMP menu. (104.96 KB, image/png)
2019-12-15 13:29 UTC, postix 		Details
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Description postix 2019-12-15 13:29:11 UTC 
Created attachment 124507 [details]
Screenshot of the transparent GIMP menu.

SUMMARY

KWin does not blur menus of GTK apps, installed by any source. 
However, it works fine for Qt apps.

STEPS TO REPRODUCE
1. Activate transparency in the Systemsettings:
Workspace behaviour: Workspace effects
-> Transparency of menus: 70%
-> Blur 60% and 40%

2. Start an GTK application like GIMP
3. Open a menu

OBSERVED RESULT

The menu background and hint background are 70% transparent.
There's no blur at all.


SOFTWARE/OS VERSIONS
Operating System: Manjaro Linux 
KDE Plasma Version: 5.17.4
KDE Frameworks Version: 5.65.0
Qt Version: 5.13.2
Comment 1 postix 2019-12-15 13:33:54 UTC 
I also tried to debug it with xprop, however 
* using the mouse and sleep, I got the same error that the mouse could not be grapped
* using the keyboard shortcuts did not open any menu when xprop was running.
Comment 2 postix 2020-10-04 14:04:12 UTC 
Can still reproduce it, even with the modesettings driver.
Comment 3 postix 2021-06-16 17:42:16 UTC 
Can reproduce it on openSUSE TW, X11
Comment 4 postix 2023-04-11 12:53:07 UTC 
Looks like this is an GTK2 issue.