https://bugs.kde.org/show_bug.cgi?id=516086

            Bug ID: 516086
           Summary: Blur behind desktop widgets leaves alpha for the mask
                    to bleed into
    Classification: Plasma
           Product: plasmashell
      Version First master
       Reported In:
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: [email protected]
          Reporter: [email protected]
                CC: [email protected]
  Target Milestone: 1.0

Created attachment 189650
  --> https://bugs.kde.org/attachment.cgi?id=189650&action=edit
Clear SVGs, smudging around widgets' edges

SUMMARY
Uniformly designed widget SVGs don't get rendered uniformly on the desktop.
There is some smudging around their edges instead. Its seems that the blur
effect blurs the region, but the edge regions remain with alpha and then the
mask bleeds into them. The issue is most obvious with more transparent themes,
but Breeze Dark is also affected.

STEPS TO REPRODUCE
1. Get a very transparent theme like Gently from GHNS or test with Breeze Dark 
2. Place some widget on the desktop
3. Observe how the edges are smudged compared to the central part of the
background

OBSERVED RESULT
Smudging around edges.

EXPECTED RESULT
The widget looks uniform in how the blur is implemented.

SOFTWARE/OS VERSIONS
Operating System: Manjaro Linux 
KDE Plasma Version: 6.6.80
KDE Frameworks Version: 6.24.0
Qt Version: 6.10.1
Kernel Version: 6.18.8-1-MANJARO (64-bit)
Graphics Platform: Wayland

ADDITIONAL INFORMATION
Marco has found a fix and is submitting a patch.

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