A lot of time has been spent on StyledTextArea and so it has improved a lot.
Many many bugs have been fixed one of the most interesting features from an API point of view is most likely support for custom graphic nodes as part of the LineRuler column.
This new API allows you to e.g. show errors like you know them from your favorite IDE.
Still there are many many bugs to fix so it’s going to be a long way to match all the features of e.g. SWT-StyledText.