When I came up with this feature in Bike I was pretty proud of the idea and it seemed original. Then a few weeks later I came across your post on StackExchange UX... everything already been invented I guess :) I'm curious how you came with idea? Also have you come across other editors that implement it?

For me I new that something bothered me about rich text editing... always seemed more painful then required. I was also aware of the idea of split cursor from Humane Interface book. And also aware of affinity idea from text cursor position in wrapped text editor lines. Bike's typing affinity came from combining those ideas.

Anyway would love to hear any related thoughts or ideas.