Scene.update(full=1) was pretty useless as it didn't actually evaluate the
depsgraph DAG. This meant, for example, that re-evaluating the parenting
tree for an armature pose could only be done by redrawing the view (which
evaluates the depsgraph). scene_update_for_newframe() is now called when Scene.update is in "full" mode; to prevent firing off newframe scriptlink events, scriptlinks are
temporarily disabled while scene_update_for_newframe() is being called.
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