godotengine
Editor Icon Saturation not applied to Custom Editor Icons
Tested versions
-Reproducible in Godot 4.3
System information
Windows 11, Godot 4.3-stable
Issue description
The editor theme icon saturation ("interface/theme/icon_saturation") is only applied to built-in icons, not custom icons set using @icon("res://...").
You can see it on the ButtonContainer icons here, notice they're not as saturated as the other Container icons.
I based these icons off of the built-in ones and they have the exact same color values.
My Editor saturation is set to 1.8 (because it's pretty ✨) and the difference is pretty apparent.
Steps to reproduce
Open the MRP, set your Editor Icon Saturation to 2.
The icons should look like this:
CustomAnimationPlayer uses the same icon as AnimationPlayer, taken from the godot repo.
It's not saturated correctly, as it's a custom icon.
