Merge pull request #7889 from Hinsbart/fix_autoenable_input

Fix auto-enable of _input processing when _input() method is set.

scene/scene_string_names.cpp

@@ -116,6 +116,7 @@ SceneStringNames::SceneStringNames() {
 	_area_enter_tree = StaticCString::create("_area_enter_tree");
 	_area_exit_tree = StaticCString::create("_area_exit_tree");
 
+	_input = StaticCString::create("_input");
 	_input_event=StaticCString::create("_input_event");
 
 	gui_input=StaticCString::create("gui_input");