Show the highlight on MeshInstance when using arrow keys on keyboard to select it

[abraaofilho10]

Edit: edited for clarity

Describe the project you are working on:
A 3D spaceship game.

Describe the problem or limitation you are having in your project:
(I'm talking about the Godot Editor)
I have many MeshInstance nodes that I need to change position, rotation, and scale. I'm reusing some meshes and making duplicates so my hierarchy is very messed. When I use arrow keys on my keyboard to navigate, I can't see the MeshInstance highlight that occurs normally if I click instead. It confuses me a lot because for me it is faster to duplicate many meshes to prototype my spaceship models (some of them are huge and have a lot of nodes) and don't rename or order them, so I need to see what is the node selected but it doesn't show the highlight.

Describe the feature / enhancement and how it helps to overcome the problem or limitation:
I want to see the current MeshInstance highlight when using up and down arrow keys.

Describe how your proposal will work, with code, pseudocode, mockups, and/or diagrams:
Just select the MeshInstance in the editor using up and down and show the highlight (like when I click) it on editor viewport.

If this enhancement will not be used often, can it be worked around with a few lines of script?:
I think it is very useful and standard behavior so it needs to exist in the engine. And it will be used very often.

[Calinou]

While this should be fine for 2D projects, selecting meshes can be slow if they have a lot of materials assigned, so I'm not sure if this is a good idea yet.

[abraaofilho10]

It does not need to select exactly the mesh. Only show a highlight at the corners as it does when you click to select. I mean, I want to select with arrows the same way it works for the mouse selection.

[Calinou]

Duplicate of godotengine/godot#36291. This is actually a bug.