Clarify documentation: Overriding Class Functions vs Setters and Getters

[TheDuriel]

Godot version:

3.1.1

OS/device including version:

Any

Issue description:

func set_default_color(new_value: Color) -> void:
    print("hey")
    default_color.a = 0.0

In a tool script on a Line2D Node results in nothing. No printing, no color change.

Steps to reproduce: ^

Minimal reproduction project:

[TheDuriel]

So, after some further discussion in discord. This is not a bug, no setters and getters are overridable if the property is not declared by the user. However, this begs the question of poor documentation. Class functions are overridable in all cases. and the original can be called in .. Setters and Getters are documented in the same manner, but are also entirely pointless since they are not overridable. There may be some hacky way to do it by overriding set and get, but thats a really bad solution if it even works.

[TheDuriel]

@KoBeWi Since you're around. Can you redo the tags please?

[henriiquecampos]

Is there anyway to at least add a warning to the Editor's warnings to communicate this in any manner? Like when we use set_* it will search in the ClassDB if this method is a built-in setter/getter and automatically warn that Built-in setter and getter functions are not overridable, then the person can decide if they want to create their own.

[bojidar-bg]

Even better: warn when a script overrides a function present in the base class which isn't marked "virtual". That way people overriding e.g. CanvasItem.update would be warned.