Physics Interpolation - add warnings to RESET_PHYSICS_INTERPOLATION

Adds warnings when NOTIFICATION_RESET_PHYSICS_INTERPOLATION is called and has no effect due to the node being hidden or not interpolated.

scene/3d/visual_instance.cpp

@@ -108,6 +108,17 @@ void VisualInstance::_notification(int p_what) {
 			if (_is_vi_visible() && is_physics_interpolated()) {
 				VisualServer::get_singleton()->instance_reset_physics_interpolation(instance);
 			}
+#if defined(DEBUG_ENABLED) && defined(TOOLS_ENABLED)
+			else if (GLOBAL_GET("debug/settings/physics_interpolation/enable_warnings")) {
+				String node_name = is_inside_tree() ? String(get_path()) : String(get_name());
+				if (!_is_vi_visible()) {
+					WARN_PRINT("[Physics interpolation] NOTIFICATION_RESET_PHYSICS_INTERPOLATION only works with unhidden nodes: \"" + node_name + "\".");
+				}
+				if (!is_physics_interpolated()) {
+					WARN_PRINT("[Physics interpolation] NOTIFICATION_RESET_PHYSICS_INTERPOLATION only works with interpolated nodes: \"" + node_name + "\".");
+				}
+			}
+#endif
 		} break;
 		case NOTIFICATION_EXIT_WORLD: {
 			VisualServer::get_singleton()->instance_set_scenario(instance, RID());