question: public static void updateActorPosition ( final Actor actor , final Vector2 newScreenSizeInStageCoords ) { if ( actor != null ) { updateActorPosition ( actor , actor . getStage ( ) , newScreenSizeInStageCoords ) ; } }
target:  When called BEFORE resizing the stage, moves the actor to match the same aspect ratio as before. Useful for windows and dialogs in screen viewports.