bug#39662: 28.0.50; Emacs crashes in x_cr_define_fringe_bitmap if (fringe-mode 0)

[Eli Zaretskii]

> Cc: thibault@thb.lt, 39662@debbugs.gnu.org
> From: Dmitry Gutov <dgutov@yandex.ru>
> Date: Tue, 18 Feb 2020 22:29:02 +0200
> 
> On 18.02.2020 22:12, Eli Zaretskii wrote:
> >> But itʼs friendlier to existing code to change 0 to 1, no?
> > Yes.
> 
> Speaking of diff-hl, signaling an error would probably be more 
> constructive since if the call succeeds, the user might turn on 
> fringe-mode and find that all bitmaps defined by diff-hl are 1-pixel 
> wide for no apparent reason.

I thought in the scenario we are discussing there will be no bitmaps
shown at all, since the scenario disables the fringes.  Isn't that so?