use blur to ensure focus event fires when turning to draggable, see https://github.com/phetsims/scenery-phet/issues/693
use blur to ensure focus event fires when turning to draggable, see https://github.com/phetsims/scenery-phet/issues/693

phetsims/scenery-phet,phetsims/scenery-phet,phetsims/scenery-phet