As mentioned in 98c7e75897, the idea of "pinning" was to have certain
animation always visible (regardless of object selection -- e.g.
animating camera movement even while animating something else).
dea7ef4dd9 added a special case that would also
include the object regardless of it being selected or not if its
**object data** is animated and pinned.
It only fully implemented that for Cameras though (that was the primary
request at that time), leaving ugly blank/empty space (pin icon missing)
for other object data types.
It is understandable that it only did it for Cameras a that time, but
there is no reason to **not** do it for other (viewport selectable)
object data types as well (animators might as well be interested in
pinning other types as well for timing reference) -- which is what this
PR does.
Adding this to 4.5 (since it fixes the blank space (even though it is
somewhat adding a feature as well...)
Pull Request: https://projects.blender.org/blender/blender/pulls/141396
ab9f03555c