Fixed the export() method of TextView and FxTextArea.
Also, fixed the spelling of whiteSpaceCollapse in the global selector. It was previously whitespaceCollapse, which wasn't in sync with the style metadata and the TLF format.
TextGraphic and TextView now respect their 'whiteSpaceCollapse' style when setting their 'content'.
QE Notes: Please test setting the 'content' of TextGraphic and TextView in various ways.
Doc Notes: None