CollisionPolygon2D doesn't expose an RID property

[Ughuuu]

Tested versions

4.3

System information

macos

Issue description

It is impossible to get the RID of a CollisionPolygon2D right now. Any other thing has a way to get RID property, which let you access directly the PhysicsServer2D if you want with that RID. Except the CollisionPolygon2D.

Steps to reproduce

Create a CollisionPolygon2D node. There is no get_rid() property.

Minimal reproduction project (MRP)

-

[Ughuuu]

As a workaround I try to get the RID by doing something like this:

var parent = node.get_parent()
if parent is CollisionObject2D:
var idx = 0
for child in parent.get_children():
    if child == node:
        break
    idx += 1
rid = PhysicsServer2D.body_get_shape(parent.get_rid(), idx)

However this doesn't work for cases where the shape isn't parented to a CollisionObject2D or when it's disabled.

[smix8]

A CollisionPolygon2D does not have a get_rid() function because it has no RID as it is not a CollisionObject2D.

A CollisionPolygon2D is a helper node for a parent CollisionObject2D node, so it is mostly dysfunctional without such parent.