Fix for Node3D request gizmos multiple times

This can result in multiple gizmos being created for the same nodes in some circumstances

Author: IphStich

scene/3d/node_3d.cpp

@@ -229,7 +229,8 @@ void Node3D::_notification(int p_what) {
 			}
 
 #ifdef TOOLS_ENABLED
-			if (is_part_of_edited_scene()) {
+			if (is_part_of_edited_scene() && !data.gizmos_requested) {
+				data.gizmos_requested = true;
 				get_tree()->call_group_flags(SceneTree::GROUP_CALL_DEFERRED, SceneStringName(_spatial_editor_group), SNAME("_request_gizmo_for_id"), get_instance_id());
 			}
 #endif
@@ -753,7 +754,10 @@ void Node3D::update_gizmos() {
 	}
 
 	if (data.gizmos.is_empty()) {
-		get_tree()->call_group_flags(SceneTree::GROUP_CALL_DEFERRED, SceneStringName(_spatial_editor_group), SNAME("_request_gizmo_for_id"), get_instance_id());
+		if (!data.gizmos_requested) {
+			data.gizmos_requested = true;
+			get_tree()->call_group_flags(SceneTree::GROUP_CALL_DEFERRED, SceneStringName(_spatial_editor_group), SNAME("_request_gizmo_for_id"), get_instance_id());
+		}
 		return;
 	}
 	if (data.gizmos_dirty) {
@@ -1450,6 +1454,7 @@ Node3D::Node3D() :
 	data.fti_frame_xform_force_update = false;
 
 #ifdef TOOLS_ENABLED
+	data.gizmos_requested = false;
 	data.gizmos_disabled = false;
 	data.gizmos_dirty = false;
 	data.transform_gizmo_visible = true;

scene/3d/node_3d.h

@@ -154,6 +154,7 @@ class Node3D : public Node {
 
 #ifdef TOOLS_ENABLED
 		Vector<Ref<Node3DGizmo>> gizmos;
+		bool gizmos_requested : 1;
 		bool gizmos_disabled : 1;
 		bool gizmos_dirty : 1;
 		bool transform_gizmo_visible : 1;