Displaying overlays numbers in the element's info/details window

The numbers of user-provided overlays in the info window are not refreshed after removing an overlay or making it public.
On below pic: view after i removed user-provided overlay no1.

added BUG label

changed milestone to %v14.0.3

mentioned in merge request !963 (merged)

closed via merge request !963 (merged)

mentioned in commit e701559a