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

[Filipe Silva]

Great news gentleman! That'd be a nice little adition to emacs!

On Thu, Jul 14, 2016 at 6:03 PM, Stefan Monnier <monnier@iro.umontreal.ca>
wrote:

> >> Actually, I don't think there needs to be flickering if the first step
> >> ("perform redisplay of window") just computes the new matrices without
> >> performing any drawing.
> > Since the display engine computes the number of each screen line as it
> > lays them out, I don't understand why would 2 phases be needed.  I'm
> > probably missing something.
>
> If we bake it into the redisplay code, we can indeed do it "on the fly",
> but if we want this feature to be implemented in Elisp it seems a lot
> more tricky to avoid the 2 passes.
>
> > So some lines will have negative numbers?
>
> Right.
>
> > And they change whenever point moves into a different line?
>
> Right.  And they're different for different windows displaying the
> same buffer.
>
> > And when the window is scrolled, the numbers also change?
>
> Well, to the extent that point probably changes when the window is
> scrolled, yes.  Otherwise not necessarily.
>
>
>         Stefan
>
>
>