Assembly syntax and also the scrollbar are not function properly as they reach the end of document they pass too much, and maybe two little button on scroll to move line by line and also move the mouse cursor so you don't haveto move you mouse each time.
multi selection and rectangular selection, similar to TextMate.
by the way I've been writting a texteditor too similar to yours in some way and when I saw yours I felt in love and cann't continue my own. :) ( I think that was such a compliment :)
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