[Gtk4] Fix Shell.computeSize to take header bar into account #2895
+84
−0
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HeaderBar is part of the regular window size in Gtk 4 on Wayland BUT gtk_window_get_headerbar returns 0 if it is not set by the application but drawn internally by Gtk itself and thus it's size can not be queried. Add a "default" GtkHeaderBar explicitly for that and take its size into account when computing Shell size.