GdkWindowend_paint

Indicates that the backing store created by the most recent call to gdk_window_begin_paint_region() should be copied onscreen and deleted, leaving the next-most-recent backing store or no backing store at all as the active paint region. See gdk_window_begin_paint_region() for full details.

It is an error to call this function without a matching gdk_window_begin_paint_region() first.