#119 Improve Performance of Syntax Highlighting

[Tim Baumgartner]

My PC is not the newest one, but usually everything works fine. Unfortunately, performance becomes a problem in the Haskell editor once the code is more than about 2 screens. Then e.g. inserting new lines by pressing and holding enter for a while results in a delay.
A few years ago, I made experiences with the Eclipse API for syntax highlighting. I know it can be quite tricky to get the damager and repairer right so that it's not necessary to parse the full editor content after each keystroke and still not loose the syntax highlighting. Maybe this can be improved in some future release.

Respect and thanks for all you've done
Tim