Outline Style

Right now the highlighting styles don't support borders. You'd have to add a span indicator that draws borders in the DrawMarks method to achieve that.

But I can see that the #region thing uses a lexical parser and has a border. How is this accomplished?

We have code that draws the outlining nodes specially, meaning the border is hard-coded for collapsed nodes.

Where would I want to add code to try to emulate that? Could it be done in the PostParse method of the Semantic class?

Well our code is internal in the drawing methods. PostParse doesn't deal with drawing.

What Boyd did was to use custom span indicators to mark all the declaration areas (your original idea I believe). That is probably the same thing we'll do when we implement it. You can possibly use PostParse to iterate through tokens that were parsed to see if span indicators should be added/removed. Although I believe in Boyd's implementation he only hooked up to the KeyTyping and SelectionChanged events and got it working with those.