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Date:	Wed, 5 Sep 2018 10:30:09 +0200
From:	Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To:	cygwin AT cygwin DOT com
Subject:	Re: Cygwin fails to utilize Unicode replacement character
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On Sep  4 14:40, Brian Inglis wrote:
> On 2018-09-04 12:20, Steven Penny wrote:
> > On Tue, 4 Sep 2018 16:18:21, Thomas Wolff wrote:
> >> My vote is against the patch because the nodef glyph will often be jus=
t blank
> >> space which is certainly worse than =E2=96=92.
>=20
> Not according to the sample below: you would have to know that medium sha=
de
> means unavailable.
>=20
> >> If conhost does not provide a reasonable way to enquire 0xFFFD availab=
ility
> >> it's conhost's fault, not cygwin's so why should cygwin implement a bad
> >> compromise. If conhost ever improves, cygwin can adapt.
> > This is some dangerous commentary. I would like to counter it now with =
some
> > actual research. Using BabelMap:
> > http://babelstone.co.uk/Software/BabelMap.html
> > You can do "Fonts", "Font Coverage" and you will get this result with c=
ode point
> > FFFD:
> > =C2=A0=C2=A0 yes: DejaVu Sans Mono
> > =C2=A0=C2=A0 no:
> > =C2=A0=C2=A0 - Consolas
> > =C2=A0=C2=A0 - Courier New
> > =C2=A0=C2=A0 - Lucida Console
> > =C2=A0=C2=A0 - MS Gothic
> > =C2=A0=C2=A0 - NSimSun
> > =C2=A0=C2=A0 - SimSun-ExtB
> > This is concerning true, but we can then review the ".notdef glyph" for=
 the
> > problem fonts. As this glyph is not an actual character, i cant paste i=
t here,
> > but i will describe them below:
> > =C2=A0=C2=A0 empty rectangle:
> > =C2=A0=C2=A0 - Courier New
> > =C2=A0=C2=A0 - Lucida Console
> > =C2=A0=C2=A0 - MS Gothic
> > =C2=A0=C2=A0 - SimSun-ExtB
> > =C2=A0=C2=A0 rectangle with a question mark inside: Consolas
>=20
> These are both recommended .notdef glyphs.
>=20
> > =C2=A0=C2=A0 none: NSimSun
>=20
> Valid OTF and TTF fonts must have a glyph with index entry 0 used for .no=
tdef.

Discussion closed for 2.11.1.  I'm going to release it as is, with
0xfffd as replacement char.

A better/more complex solution will have to go into the next release.


Thanks,
Corinna

--=20
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

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