Track the change of effective dominance of a rigid-body.

src/dynamics/rigid_body.rs

@@ -331,7 +331,10 @@ impl RigidBody {
 
     /// The dominance group of this rigid-body.
     pub fn set_dominance_group(&mut self, dominance: i8) {
-        self.rb_dominance.0 = dominance
+        if self.rb_dominance.0 != dominance {
+            self.changes.insert(RigidBodyChanges::DOMINANCE);
+            self.rb_dominance.0 = dominance
+        }
     }
 
     /// Adds a collider to this rigid-body.

src/dynamics/rigid_body_components.rs

@@ -107,6 +107,8 @@ bitflags::bitflags! {
         const COLLIDERS   = 1 << 3;
         /// Flag indicating that the `RigidBodyType` component of this rigid-body has been modified.
         const TYPE        = 1 << 4;
+        /// Flag indicating that the `RigidBodyDominance` component of this rigid-body has been modified.
+        const DOMINANCE   = 1 << 5;
     }
 }