-shadergraph now saved when on external file and modified, fixes #1832

core/undo_redo.cpp

@@ -234,11 +234,17 @@ void UndoRedo::_process_operation_list(List<Operation>::Element *E) {
 			ERR_FAIL_COND(!obj);
 
 		}
+
 		switch(op.type) {
 
 			case Operation::TYPE_METHOD: {
 
-				obj->call(op.name,VARIANT_ARGS_FROM_ARRAY(op.args));
+				obj->call(op.name,VARIANT_ARGS_FROM_ARRAY(op.args));				
+#ifdef TOOLS_ENABLED
+				Resource* res = obj->cast_to<Resource>();
+				if (res)
+					res->set_edited(true);
+#endif
 			} break;
 			case Operation::TYPE_PROPERTY: {