fix(DejaOverlayComponent): only throw visibilityChanged if old value is different from new value
fix(DejaOverlayComponent): only throw visibilityChanged if old value is different from new value

DSI-HUG/dejajs-components,DSI-HUG/dejajs-components,DSI-HUG/dejajs-components,DSI-HUG/dejajs-components