https://bugs.kde.org/show_bug.cgi?id=398832
Bug ID: 398832
Summary: window-state-event is not sent for focus change when
CSD is enabled
Product: kwin
Version: 5.13.4
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: core
Assignee: kwin-bugs-n...@kde.org
Reporter: stran...@redhat.com
Target Milestone: ---
Expected behaviour
Gnome sends window_state_event when application focus changes. Gtk reacts to it
by setting GTK_STATE_FLAG_BACKDROP flag (by ensure_state_flag_backdrop() at
gtkwindow.c) to the window which is picked by theme to correctly shade the
window.
Actual behaviour
Gtk applications with CSD enabled (gedit, firefox for instance) does not get
window_state_event with focus change so the application looks active even when
it's on background.
Also default KDE theme does not work well with the "backdrop" state and the
theme does not render some elements (scrollbar thumb for instance -
https://bugzilla.mozilla.org/show_bug.cgi?id=1491374)
Steps to reproduce
1) Open gedit
2) Open another application, make gedit partially visible
3) switch to gedit and back - gedit titlebar does not change its color although
it should
It also causes issue with Firefox as it uses default theme under KDE which does
not render thumb with backdrop state -
https://bugzilla.mozilla.org/show_bug.cgi?id=1491374
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