Fix flicker when size allocating gtk actors
Fix flicker when size allocating gtk actors

The size allocate that happens when we draw may cause exposures, ensure
that we draw them before returning so that we don't draw partial results,
causing flicker.

GNOME/clutter-gtk,Distrotech/clutter-gtk,Distrotech/clutter-gtk,GNOME/clutter-gtk,Distrotech/clutter-gtk