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

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

On 2020-12-04 11:33+0100 Robert Pluim <rpluim@gmail.com> wrote:

> tastytea <tastytea@tastytea.de> writes:
> 
> >> 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.
> >  
> 
> You want emojis in your terminal emulator? I guess thereʼs no
> accounting for taste :-)

It's not just the terminal emulator, that was just the quickest to
check. Qt programs require these settings too. Gtk programs work
without it for some reason.

> >> 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).  
> 
> That surprises me, but then again this is fontconfig. Last time I
> checked, Noto Color Emoji was already in the default fontconfig
> settings, at least on Debian, so I wonder why you needed to have your
> local settings.

It is in the settings, just not high enough in the list.

My point is that my approach seems to be the recommended way to reorder
the font list, and all other programs work fine with it.
Emacs uses the font with the highest priority in the preferred list, as
expected, unless “Noto Color Emoji” or “Noto Emoji” is in that list.