TYPO3 Core

Currently category mount points to not show hierarchy information.
Which is an issue because of multiple things:
1.) If I have categories
foo --> bar
xyz --> bar

And mount both "bar" categories, it is not clear which bar it is.

2.) If in my TCA I use nonSelectable Levels or max levels, they will be different because the hierary information is missing.

I am not sure if this might be related to:
https://forge.typo3.org/issues/66519
but from the description it is a different issue.

My solution would be to render mounted categories in sublevels with parent categories but make parent categories unSelectable.
Furthermore, if I select multiple categories in sublevels of one parent, it needs to be ensured that parent is only listed once.

Here would also be the question if non selected categories of a level (if that level has mounted categories) should be shown if the parent category is mounted or if the should not be shown/selectable in this case.

In the current version they would be shown, so the provided patch also makes them visible.

Attached screenshots with shown categories and category mount points with patch.

Set patch to -1 because I don't want it in the 7.2 stabilisation phase.