Selection is slow on some nodes (e.g. Skeleton or AnimationPlayer) in the scene tree dock

[heretique]

Godot version: 3.1 (commit: ce114e3)
OS/device including version: Windows 10
Issue description:
When selecting nodes in the scene hierarchy some nodes have a big delay between mouse click and actual selection of the node even with a simple scene.
Steps to reproduce:
Please check the video file.
Minimal reproduction project:
MicroDungeons.zip

[akien-mga]

This is probably related to the Skeleton's gizmo, which might be recreated each time the node is selected I guess?

[heretique]

I've noticed being slow when selecting the AnimationPlayer node also, not only on Skeleton node.

[Calinou]

@heretique Can you (or anyone else) still reproduce this bug in Godot 3.3.2 or any later release?

[heretique]

I'm away from my computer for one week. I could check when I get back if it's not too late.

[AaronRecord]

I can reproduce this bug with 3.4 on the third person shooter demo when selecting the player skeleton. I suspect it's because it's creating inspector properties for every single bone.