video-texture: filter out non-changing state events
video-texture: filter out non-changing state events

Signed-off-by: Lionel Landwerlin <9463032a5b99ffad10f36631678a833369a311b5@linux.intel.com>

ystreet/clutter-gst,skinkie/clutter-gst,lubosz/clutter-gst,ystreet/clutter-gst,ystreet/clutter-gst,lubosz/clutter-gst,lubosz/clutter-gst,GNOME/clutter-gst,GNOME/clutter-gst,ystreet/clutter-gst,GNOME/clutter-gst,skinkie/clutter-gst,GNOME/clutter-gst,skinkie/clutter-gst