The Gumbo TextArea now supports scrolling.
When the Scroller component is ready for use, TextAreaSkin will use it, but for now I've made TextArea have optional skin parts named horizontalScrollBar and verticalScrollBar. Their presence or absence is determined by new properties, horizontalScrollPolicy and verticalScrollPolicy, which can be "on" or "off". (An "auto" setting is not yet supported, but will be for Scroller.) By default the vertical scroll bar is on and the horizontal scroll bar is off.
Also, TextArea no longer extends TextInput. Instead both extend a new TextBase class.