Re: relative line numbers and folding: how to make they play along?

[Stefan Monnier]

> What are "relative line numbers" in Emacs?  I see nothing in these
> discussions that describes how (with what commands/packages) the line
> numbers were produced in Emacs.  So it's hard to tell anything
> intelligent about this issue.

I think to implement relative-visual-linum-mode efficiently, we'd need
help from the display engine.  E.g.:
- First perform redisplay of the window.
- then, go through the window, visual-line by visual-line
  and add something in the margin.
- then update the margin part of the matrices.


        Stefan