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Alexander Larsson authored
When we just invalidate some area from the app we don't need to clear windows with no exposure mask, because that wouldn't have happened pre-csw anyway. Additionally we can avoid such clearing for native windows in cases where the xserver already did the clearing like on exposes or when resizing toplevels. This means we don't fully redraw a GtkSocket when it resizes, thus avoiding flicker in gnome-mplayer as reported in this bug: https://bugzilla.gnome.org/show_bug.cgi?id=598050
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