GNU bug report logs - #73752
29.4; Ligatures are randomly rendered with extra spaces

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From: Eli Zaretskii <eliz <at> gnu.org>
To: Visuwesh <visuweshm <at> gmail.com>
Cc: dev <at> real-or-random.org, xuan <at> xlk.me, 73752 <at> debbugs.gnu.org
Subject: bug#73752: 29.4; Ligatures are randomly rendered with extra spaces
Date: Sat, 02 Nov 2024 19:18:05 +0200

> From: Visuwesh <visuweshm <at> gmail.com>
> Cc: dev <at> real-or-random.org,  xuan <at> xlk.me,  73752 <at> debbugs.gnu.org
> Date: Sat, 02 Nov 2024 22:34:44 +0530
> 
> [சனி நவம்பர் 02, 2024] Eli Zaretskii wrote:
> 
> > Thanks, but this is a false alarm: the lgstring's glyphs don't have
> > the [XOFF YOFF WADJUST] component.  So either my breakpoint condition
> > is somehow wrong, or you mistyped it, or something else.
> 
> I don't think I mistyped the condition at least.  Here's what I typed:
> 
>     (gdb) break hbfont.c:598 if xoff == 0 && yoff == 0 && wadjust == metrics.width && LGLYPH_ADJUSTMENT(lglyph) != Qnil
> 
> >  What does GDB show if you type
> >
> >   (gdb) p LGLYPH_ADJUSTMENT(lglyph)
> >   (gdb) p Qnil
> 
>     (gdb) p LGLYPH_ADJUSTMENT(lglyph)
>     $3 = XIL(0)
>     (gdb) p Qnil
>     $4 = XIL(0)

OK, but then why did the breakpoint break, when the condition is
obviously false: LGLYPH_ADJUSTMENT(lglyph) == Qnil.

What happens if you type this:

  (gdb) p Qnil+0

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