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Debarshi Ray authored
GtkWidget::visibility-notify-event doesn't work on modern composited windowing systems. In such cases one can only assume that the widget is always completely visible (ie. GDK_VISIBILITY_UNOBSCURED). These days most users have a compositor, and therefore bugs in this optimization often manage to survive undetected. https://bugzilla.gnome.org/show_bug.cgi?id=794214
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