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bug#25216: 26.0.50 [regression]; Curly quotes are not found in some size

From: Eli Zaretskii
Subject: bug#25216: 26.0.50 [regression]; Curly quotes are not found in some sizes of ‘Terminus’ font
Date: Sat, 31 Dec 2016 10:57:30 +0200

> From: Dmitry Alexandrov <address@hidden>
> Cc: address@hidden
> Date: Sat, 31 Dec 2016 08:56:21 +0300
> >> > And I still don't understand why you need that.  AFAICS, Emacs
> >> > explicitly tries to use the default font for punctuation and symbol
> >> > characters before falling back on looking up other fonts.
> >> 
> >> Do you mean that you could not reproduce this?
> >
> > It means I don't understand how it could happen.  The function
> > face_for_char (defined in fontset.c) explicitly tries the current
> > default font for any punctuation and symbol character, before it
> > starts looking in other fonts.  I don't understand why this fails for
> > you, and only in certain font sizes on top of that.  Perhaps you could
> > step through that code with a debugger and see what happens there?
> Well.  font_has_char of font.c:2989 returns 0 ← xftfont_has_char of 
> xftfont.c:532 returns 0 ← XftCharExists of libXft.so.2 returns 0.
> So the problem goes into libxft2.

Thanks for digging into this.  So in this case libxft2 says that
character is not available, whereas in fact it is?  Or did I

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