bug#56808: 29.0.50; Elusive display problem on macOS

[Eli Zaretskii]

> From: Gerd Möllmann <gerd.moellmann@gmail.com>
> Cc: 56808@debbugs.gnu.org
> Date: Thu, 28 Jul 2022 17:04:59 +0200
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > M-? (a.k.a. xref-find-references) cannot find it?
> 
> No it doesn't.  Apparently it doesn't use the lsp backend.  Don't know
> if it should.

It shouldn't, but why do you need LSP?  xref-find-references has local
alternatives for that, e.g. ID-Utils or Grep.

> >>   glyph = macfont_get_glyph_for_character (font, ' ');
> >>   if (glyph != kCGFontIndexInvalid)
> >>     font->space_width = macfont_glyph_extents (font, glyph, NULL, NULL, 0);
> >>   else
> >>     /* dirty workaround */
> >>     font->space_width = pixel_size;
> >> 
> >> I don't think the else branch has been taken, because that wouldn't lead
> >> to a value of 8.
> >
> > Maybe you should run with a watchpoint on font->space_width.
> 
> I suspect that it's really 8 at some point during startup, and that it
> isn't overwritten.  The reason for this is that the two places above are
> the only ones assigning to space_width, which I trust clangd to know.

Then how did you get 7 in the other image you posted?