https://bugs.kde.org/show_bug.cgi?id=451156

            Bug ID: 451156
           Summary: Changes to shadows in Breeze window decoration options
                    don't propagate to the gtk theme
           Product: Breeze
           Version: 5.24.2
          Platform: Archlinux Packages
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: gtk theme
          Assignee: uhh...@gmail.com
          Reporter: adam.m.fontenot+...@gmail.com
                CC: plasma-b...@kde.org
  Target Milestone: ---

SUMMARY
I'm using the Breeze window decorations and the Breeze application style as
well. Breeze-GTK is set as my GTK application style (using the System Settings
module).

I find the default window shadows for Breeze to be much too large and dark -
actually they're strong enough that they create a small amount of banding on my
screen, which I find intolerable - and so I make it much smaller and lighter.
Unfortunately, even though KDE seems to control the appearance of most GTK
applications pretty well, changing the shadow settings doesn't do anything at
all.

STEPS TO REPRODUCE
1. Make sure all instances of a Gnome application (the Image Viewer, eog, is my
go-to for testing) are closed, and that you are using the Breeze window
decorations and Breeze-GTK as your Gnome/GTK theme. This bug is reproduced
under KDE, not in a Gnome session. 
2. Change the shadow setting for your window decorations. System Settings >
Appearance > Global Theme > Window Decorations; click the edit "pencil" icon on
the Breeze theme in the main window; use the Shadow tab. Click OK and make sure
the changes are properly applied in KDE applications.
3. Reopen a Gnome / GTK application.

OBSERVED RESULT
No change to the shadows of the GTK application.

EXPECTED RESULT
The GTK application window should have exactly the same shadows as other
windows under KWin - at least when the matching themes Breeze and Breeze GTK
are used.

SOFTWARE/OS VERSIONS
Linux: Arch Linux kernel 5.16.11 x86_64
KDE Plasma Version: 5.24.2
KDE Frameworks Version: 5.91.0
Qt Version: 5.15.2

ADDITIONAL INFORMATION

Graphics platform is X11.

I was able to work around the issue by manually changing the window shadows in
~/.config/gtk-3.0/gtk.css. Since (I think?) KDE manages these files when the
Settings module changes the options for GTK applications, it should be possible
to add handling for changing the shadows automatically.

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