https://bugs.kde.org/show_bug.cgi?id=420110

            Bug ID: 420110
           Summary: Scrollwheel does not work for some non focused GTK app
                    windows
           Product: kwin
           Version: 5.18.4
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: input
          Assignee: [email protected]
          Reporter: [email protected]
  Target Milestone: ---

Let's have two apps, a Qt and a GTK app, side by side. 

1) If you select the GTK app and hover the mouse over the Qt app's window, you
can use the scrollwheel.
2) If you select the Qt app and hover the mouse over the GTK app's window, it
does not work for some GTK apps.


- GTK apps for which it does not work include Xournal, Dino, Lutris
+ GTK apps for which it does work are Firefox and GIMP


Is there something special GTK apps have to implement or does KWin not support
all necessary parts of GTK in order to support this feature for all kind of
apps?


SOFTWARE/OS VERSIONS
Operating System: Manjaro Linux 
KDE Plasma Version: 5.18.4
KDE Frameworks Version: 5.69.0
Qt Version: 5.14.2
X11

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