bug#59719: 29.0.60; emacs-news-mode does not adjust the width of the fringe to accommodate the outline icons

[Eli Zaretskii]

> From: Juri Linkov <juri@linkov.net>
> Cc: justksqsf@gmail.com,  59719@debbugs.gnu.org
> Date: Wed, 30 Nov 2022 19:56:00 +0200
> 
> >> This is a known limitation of the margin area: its width is limited
> >> to 10 pixels.
> >
> > ??? The width of the display margin can be controlled by set-window-margins.
> 
> set-window-margins specifies the number of characters.

Yes.  But that's not a problem: you can ask for 2 or 3 characters, as
needed.

> Maybe need to set the margin width to more characters if string-width
> returns more than 1 character?

Why not use string-pixel-width, and divide by what default-font-width
returns?

> But the core problem is that when font size is increased in the buffer,
> the margin pixel size doesn't increase proportionally.

This is how the margins were designed: they never resize automatically.  It
is up to the Lisp program to do that.