https://bugs.kde.org/show_bug.cgi?id=415053

            Bug ID: 415053
           Summary: Changing themes freezes System Settings
           Product: systemsettings
           Version: 5.17.4
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: grave
          Priority: NOR
         Component: kcm_gtk
          Assignee: aleix...@gmail.com
          Reporter: n...@kde.org
  Target Milestone: ---

STEPS TO REPRODUCE
1. Navigate to System Settings > Application Style > GNOME/GTK Application
style
2. Change the GTK2 or GTK3 theme from anything to anything
3. Click apply

OBSERVED RESULT
System Settings freezes indefinitely. The console log says the following:

(systemsettings5:31664): GLib-GObject-WARNING **: 15:46:39.553: cannot register
existing type 'GdkDisplayManager'

(systemsettings5:31664): GLib-CRITICAL **: 15:46:39.553: g_once_init_leave:
assertion 'result != 0' failed

(systemsettings5:31664): GLib-GObject-CRITICAL **: 15:46:39.553:
g_object_new_with_properties: assertion 'G_TYPE_IS_OBJECT (object_type)' failed


EXPECTED RESULT
it works

ADDITIONAL INFORMATION
If you kill systemsettings and open the KCM again, the GTK2 theme was
successfully changed, the the GTK3 one was not.

I can reproduce this on git master, but a user in the Plasma telegram channel
has reported it against Plasma 5.17.4 too.

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