bug#74876: 31.0.50; Force fringe refresh / force-window-update not affecting fringes

[Eli Zaretskii]

> From: Michal Nazarewicz <mina86@mina86.com>
> Cc: 74876@debbugs.gnu.org
> Date: Mon, 16 Dec 2024 22:47:43 +0100
> 
> On Sun, Dec 15 2024, Eli Zaretskii wrote:
> > Thanks.  I don't think what you want can possibly work, unless we
> > completely redesign how the fringes are updated.
> 
> Well… there’s always the atomic option of calling redraw-frame.  Though
> I’ve found that changing an attribute of a font is sufficient.
> I believe what makes things work is setting f->face_change and calling
> fset_redisplay.

Both methods are quite expensive, and will cause flickering in some
configurations, so I recommend against that.