[kde] [Bug 451983] New: Task bar changes its theme with some apps

[David]

https://bugs.kde.org/show_bug.cgi?id=451983

            Bug ID: 451983
           Summary: Task bar changes its theme with some apps
           Product: kde
           Version: unspecified
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: unassigned-bugs at kde.org
          Reporter: david.cortes.rivera at gmail.com
  Target Milestone: ---

SUMMARY
Some applications (not sure which exactly, here I'm giving one example but I'm
not very sure about other apps), if launched under one plasma style and then
launched again under another plasma style, will make the task bar change its
theme to the older theme that was configured when the application was first
launched.
(Note that this is not an accent color and it changes more than just the color
of the taskbar, such as the style in the menu that opens with the "Meta" key)

STEPS TO REPRODUCE
1. Go to System Settings -> Appearance -> Plasma Style, and set Oxygen as the
theme.
2. Launch Vivaldi (web browser), and configure it to restore previous session
at startup (Settings -> type "res" in the search bar, find the "Startup"
option, and set it to "Last Session"). Just in case, configure it to use system
theme (Settings -> Themes -> Theme Schedule -> Operating System). Restart
Vivaldi for the changes to take effect.
3. Open many tabs in Vivaldi and close it with the tabs still opened (so that
it restores them next time it is launched).
4. Change plasma style to breeze in the same settings as before.
5. Restart the computer.
6. Launch Vivaldi.

OBSERVED RESULT
Task bar adopts oxygen theme, although only partially (system tray icons are
breeze, everything else is oxygen). Upon further restarts, a larger fraction of
it will start becoming breeze (e.g. active app indicators will later become
breeze).

EXPECTED RESULT
Task bar should not change its theme according to applications that are opened.
Moreover, it shouldn't at any point have pieces of one theme and pieces of the
other, nor look as if the bar were broken due to having the top part of the bar
in one color and the bottom part in another color (due to different colors from
themes).

SOFTWARE/OS VERSIONS
Operating System: Debian GNU/Linux
KDE Plasma Version: 5.24.3
KDE Frameworks Version: 5.90.0
Qt Version: 5.15.2
Kernel Version: 5.16.0-5-amd64 (64-bit)
Graphics Platform: X11
Processors: 16 × AMD Ryzen 7 2700 Eight-Core Processor
Memory: 15.6 GiB of RAM
Graphics Processor: AMD VEGA10

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