Path completion for "unique name" nodes fills in the full path rather than only the node name

[mieldepoche]

Godot version

4.0.3

System information

linux

Issue description

consider a scene with a node marked as unique name:

Trying to access it leads to this:

which is not expected I think.

Steps to reproduce

1. create a scene with a uniquely-named node that has a bunch of parents and grandparents
2. try to access this node via a script using the % operator, and notice how it gives you the full path as an autocomplete candidate.

Minimal reproduction project

UniqueNameAutocomplete.zip

[KoBeWi]

Related: godotengine/godot-proposals#4593 (the proposal might be outdated, because % shorthand didn't exist then)

[opyate]

Especially jarring if there are multiple options, but you can see what they are (possibly due to my unique node having plenty of children/grandchildren of its own):