bug#43148: 27.1; Widget text seems to disappear when building with Cairo and Xaw

[tastytea]

On 2020-12-04 10:48+0100 Robert Pluim <rpluim@gmail.com> wrote:

> tastytea via "Bug reports for GNU Emacs, the Swiss army knife of text
> editors" <bug-gnu-emacs@gnu.org> writes:
> 
> > With the patch I get rectangles instead of letters.
> >
> > I removed Noto Color Emoji from my font configuration in
> > ~/.config/fontconfig/fonts.conf and that did the trick. The menus
> > are showing text now with and without the patch. But I have no idea
> > why, all other programs work fine with that configuration:
> >
> > <?xml version="1.0" encoding="UTF-8"?>
> > <!DOCTYPE fontconfig SYSTEM "fonts.dtd">
> > <fontconfig>
> >   <!-- Prefer Noto's Color Emoji Font -->
> >   <alias>
> >     <family>serif</family>
> >     <prefer>
> >       <family>Noto Color Emoji</family>
> >     </prefer>
> >   </alias>  
> 
> If youʼre trying to say "I want to use Noto Color Emoji for emojis",
> then I think you should write
> 
> <family>emoji</family>

That doesn't work, at least not in my terminal emulator.

> not "serif" and "sans-serif", as Noto Color Emoji doesnʼt cover the
> usual codepoints that are used for text.

All the tutorials on the internet say to write it in "serif",
"sans-serif" and "monospace". If the first font (Source Sans Pro in my
case) doesn't cover the codepoint, the next font is used (Noto Color
Emoji).