gboolean gdk_pixbuf_animation_iter_on_currently_loading_frame ( GdkPixbufAnimationIter* iter )
Used to determine how to respond to the area_updated signal on
GdkPixbufLoader when loading an animation.
::area_updated signal is emitted for an area of the frame currently
streaming in to the loader. So if you’re on the currently loading frame,
you will need to redraw the screen for the updated area.