[dolphin] [Bug 441533] New: Dolphin's terminal panel is partially transparent on Wayland even though it shouldn't be with Breeze

[Firlaev-Hans]

https://bugs.kde.org/show_bug.cgi?id=441533

            Bug ID: 441533
           Summary: Dolphin's terminal panel is partially transparent on
                    Wayland even though it shouldn't be with Breeze
           Product: dolphin
           Version: 21.08.0
          Platform: Fedora RPMs
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: panels: terminal
          Assignee: dolphin-bugs-null at kde.org
          Reporter: firlaevhans.fiete at protonmail.com
                CC: kfm-devel at kde.org
  Target Milestone: ---

SUMMARY
In Konsole, I set the background to be 10% transparent and blurred. On X11 with
Breeze, this setting does not affect Dolphins terminal panel which always stays
opaque. On Wayland, however, it does become transparent (except for a glitchy
looking opaque bar at the top). Also, the background is only transparent, not
blurred. It looks rather broken.

STEPS TO REPRODUCE
1. Enable background transparency in Konsole. Also enable blur.
2. Use the default Breeze application style (I used the Breeze Dark color
scheme)
3. Open Dolphin on Wayland
4. Show the built-in terminal with F4.

OBSERVED RESULT
The terminal panel is transparent, but not blurred. A flickering bar at the top
of the terminal panel is not transparent and seems to show parts of older
frames of the terminal some of the time.

EXPECTED RESULT
The terminal inside Dolphin should either
a) ignore the transparency setting and stay opaque like it does on X11, or
b) it should be transparent AND BLURRED, without a weird glitchy bar at the top
(like on X11 with some third party Application styles).

SOFTWARE/OS VERSIONS
Operating System: Fedora 34
KDE Plasma Version: 5.22.4
KDE Frameworks Version: 5.85.0
Qt Version: 5.15.2
Graphics Platform: Wayland

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