Document CollisionObject2D pickable requires collision_layer
Created by: lopho
Document CollisionObject2D signals mouse_entered
, mouse_exited
and input_event
require at least one collision_layer
to be set.
Sadly, collision_layer
is implemented, and thus documented in the child classes Area2D
and PhysicsBody2D
(why not in the parent class?), so this might be a source of confusion.
Clarifies #11159