Tested versions

v4.2.2.stable.official [15073af]

System information

Ubuntu 22.04

Issue description

Mesh (such as a Sphere) is regenerated, wasting work, when the result will be exactly the same.

Steps to reproduce

Add this to a _process():

mesh.radius = 0.5

(in a real-world app, the value is calculated every frame based on user settings, but when the value is not changing, it still rebuilds the mesh)

Minimal reproduction project (MRP)

I'm wondering if a line like this would be appropriate:

if is_equal_approx(radius, p_radius) { return }

Otherwise, the app has to do it in GDScript, which is much slower than C++, duplicated work across godot apps, etc.

I think this easy optimization should be added everywhere in Godot when changing a setting triggers heavy work.

If this is not implemented, then the docs should be updated to warn about the performance hit "even if setting to the same value".