bug#41645: 27.0.91; Combining Grapheme Joiner (#x34f) gui artifacts

[David Fussner via "Bug reports for GNU Emacs, the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>]

You're quite right! At beginning of buffer, or indeed beginning of
line, I see the artifact and the CGJ as a separate glyph after C-u C-x
=, even if the fonts match. With your patch, C-u C-x = is the same,
but no artifact.

On Tue, 2 Jun 2020 at 15:07, Pip Cet <pipcet@gmail.com> wrote:
>
> On Tue, Jun 2, 2020 at 2:00 PM David Fussner <dfussner@googlemail.com> wrote:
> > Addendum to my previous email: my apologies for the inaccuracy in my
> > initial bug report -- I believe I failed to notice in the Latin script
> > that the letter glyphs were from DejaVu Sans Mono and the CGJ from
> > DejaVu Sans
>
> I was confused about the same point, actually!
>
> > , hence the artifacts there. When both are DejaVu Sans, the
> > issue doesn't appear, except in the Hebrew examples.
>
> Not even when you try entering a CGJ as the first character in a
> buffer? I still saw the issue in that case, because
> compose-gstring-for-graphic was called with a single glyph, for which
> it returned the questionable lgstring.
>
> Thanks for testing my patch :-)