bug#29279: Sharing the margins

[Eli Zaretskii]

> Date: Tue, 14 Nov 2017 19:30:54 +0100
> From: martin rudalics <rudalics@gmx.at>
> CC: dgutov@yandex.ru, 29279@debbugs.gnu.org
> 
>  > This would make it hard to request to be the leftmost or rightmost
>  > column, I think.
> 
> most-negative/positive-fixnum maybe?

That's a possibility, but it seems less natural to me.

Anyway, these are small tidbits that are better figured out during
implementation, I think.

>  >> BTW is ‘window-margin-modify’ just for the sake of the line numbers
>  >> codes or which other users would it have?
>  >
>  > Any package whose requirement of the margin width is not constant, but
>  > has to change due to some event.  Even visual-fill-column should need
>  > it, I think.
> 
> What is visual-fill-column?

See 

   http://lists.gnu.org/archive/html/emacs-devel/2015-11/msg01171.html