Italic mark for "associated categories" in Category filter pane

[nji9]

When you filter for some category/ies
and then in the result pane select some/all of the resulting images
in the panes "Categories" and "Category Sets"
the categories which are assigned to a true subset of the images
are pictured:
- dark filled check boxes (in Categories pane) and
- white background and italic marked (in Categoriy Sets pane).

To know these "associated" categories is very useful,
for (beside other info) it lets you know,
which additional (or substractional) filter would be effective at all.

However this special mark is missing in Category filter pane!
(To my experience the most useful place for it).

My suggestion:
For selected images: Show the "associated categories" italic.
(BTW All this maybe not only for categories, but for all filter types...)