e420caab19 already fixed this for "manually" changing visibility, but
if this change comes through animation, these notifiers dont fire (rna
callbacks dont run).
So to resolve, also redraw on `ND_FRAME`, this is something every region
in animation editors listens to anyways, so probably right for
consistency (and to solve this bug), even though it might eat away some
ticks.
Pull Request: https://projects.blender.org/blender/blender/pulls/127145
f883cb77ba