Bug 418215

Summary: Blur effect is affected by transparency
Product: [Plasma] kwin Reporter: Martmists <martmists>
Component: effects-variousAssignee: KWin default assignee <kwin-bugs-null>
Status: RESOLVED INTENTIONAL    
Severity: minor    
Priority: NOR    
Version First Reported In: unspecified   
Target Milestone: ---   
Platform: Arch Linux   
OS: Linux   
Latest Commit: Version Fixed/Implemented In:
Sentry Crash Report:

Description Martmists 2020-02-26 11:56:39 UTC 
SUMMARY
Blur effect is affected by transparency setting instead of keeping the blur constant when the transparency changes.


STEPS TO REPRODUCE
1. Set window transparency focused to 90%, unfocused to 30%
2. Enable Blur
3. Switch between enabled/disabled states

OBSERVED RESULT
The window blur practically disappears as it goes unfocused

EXPECTED RESULT
The blur effect stays as the window goes unfocused

SOFTWARE/OS VERSIONS
(copied from System Information)
Operating System: Arch Linux 
KDE Plasma Version: 5.18.1
KDE Frameworks Version: 5.67.0
Qt Version: 5.14.1
Kernel Version: 5.5.5-arch1-1
OS Type: 64-bit
Processors: 12 × Intel® Core™ i7-8750H CPU @ 2.20GHz
Memory: 15.4 GiB of RAM
Comment 1 Vlad Zahorodnii 2020-03-19 09:17:25 UTC 
This is intentional. If the window goes transparent, then nothing should be blurred behind it.