Mouse event handlers are not called on TextArea

Controls consume mouse events, so they don't bubble up to their parents. But normally one can register a handler on a control and it gets called (before the event is consumed).

TextArea, however, has ScrollPane as a child. ScrollPane is a control, hence it consumes the mouse events and doesn't let them bubble to the TextArea. As a result of that, no mouse event handlers registered on TextArea are ever called.