Fix a layer's transform being reset when it's reordered within its same parent (#2624)

Fix layer transform reset when being reordered within the same group/parent

Author: moosama76

editor/src/messages/portfolio/document/document_message_handler.rs

@@ -684,15 +684,17 @@ impl MessageHandler<DocumentMessage, DocumentMessageData<'_>> for DocumentMessag
 						insert_index: calculated_insert_index,
 					});
 
-					let layer_local_transform = self.network_interface.document_metadata().transform_to_viewport(layer_to_move);
-					let undo_transform = self.network_interface.document_metadata().transform_to_viewport(parent).inverse();
-					let transform = undo_transform * layer_local_transform;
-					responses.add(GraphOperationMessage::TransformSet {
-						layer: layer_to_move,
-						transform,
-						transform_in: TransformIn::Local,
-						skip_rerender: false,
-					});
+					if layer_to_move.parent(self.metadata()) != Some(parent) {
+						let layer_local_transform = self.network_interface.document_metadata().transform_to_viewport(layer_to_move);
+						let undo_transform = self.network_interface.document_metadata().transform_to_viewport(parent).inverse();
+						let transform = undo_transform * layer_local_transform;
+						responses.add(GraphOperationMessage::TransformSet {
+							layer: layer_to_move,
+							transform,
+							transform_in: TransformIn::Local,
+							skip_rerender: false,
+						});
+					}
 				}
 
 				responses.add(NodeGraphMessage::RunDocumentGraph);