A pad without a buffer or with a GAP buffer cannot obscure a pad below it. Ignore those when considering whether a pad should be drawn. Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/708>
A pad without a buffer or with a GAP buffer cannot obscure a pad below it. Ignore those when considering whether a pad should be drawn. Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/708>