The feature should now be up and running, although it might have
some performance issues. Please test with small changes :S as it
scales quadratic with the size of a single change.
If I look at DocRange::length() there is certainly a lot of room for
improvement ;-)
Only that it isn't really in the critical path.
Maybe there is a reason why you didn't do it that way?
Well, I copy-pasted it and I probably didn't have a second look at it.
Another reason is that you counted the first paragraph twice, and forgot
the +1 ;).. Anyway, I committed it.
Thanks,
Vincent
