This PR changes the `vert_hide_update` function to flush visibility
from the selected vertices to their corresponding faces on the node
level instead of on the mesh level. This ensures that in certain cases
where vertices exist along the border of a nodes are selected that
all corresponding faces are updated and their PBVH nodes are tagged
for updating appropriately.
Additionally, this provides a roughly 15ms improvement over the current
implementation operating on a subdivided sphere of 32 million vertices
when selecting a relatively small portion of the mesh. (50ms -> 35ms).
Spawned from a discussion on #120798
Pull Request: https://projects.blender.org/blender/blender/pulls/121678
7017091272