[Bug 1332250] New: Incorrect font configuration

[Red Hat Bugzilla]

https://bugzilla.redhat.com/show_bug.cgi?id=1332250

            Bug ID: 1332250
           Summary: Incorrect font configuration
           Product: Fedora
           Version: rawhide
         Component: open-sans-fonts
          Assignee: pvoborni(a)redhat.com
          Reporter: dag.odenhall(a)gmail.com
        QA Contact: extras-qa(a)fedoraproject.org
                CC: fonts-bugs(a)lists.fedoraproject.org,
                    pvoborni(a)redhat.com



When a website requests Open Sans, Firefox uses Comfortaa.  I have both fonts
installed.  I don't know if the following is the cause, because the matching
works correctly with fc-match, but I discovered this and it's still wrong, I
think.

The open-sans-fonts package includes this fontconfig rule:

  <alias>
    <family>Open Sans</family>
    <prefer>
      <family>sans-serif</family>
    </prefer>
  </alias>

In my understanding of fontconfig, this is saying "Edit the font family list
for Open Sans and prepend the sans-serif font family" i.e. Open Sans itself is
given *less* priority than all other sans-serif fonts.  The
aajohan-comfortaa-fonts package includes this (correct) rule:

  <alias>
     <family>sans-serif</family>
     <prefer>
    <family>Comfortaa</family>
     </prefer>
  </alias>

And so perhaps C being early in the alphabet or perhaps because being the next
fontconfig file in my conf.d (I don't fully understand fontconfig) the combined
effect ends up being "When looking for Open Sans, the first match is sans-serif
which in turn is Comfortaa".

I think the Open Sans rule above should be edited to something closer to the
Comfortaa rule above, like:

 <alias>
    <family>sans-serif</family>
     <prefer>
    <family>Open Sans</family>
     </prefer>
 </alias>

The second rule it contains is also wrong, I think, and not like how any other
fonts are configured:

  <alias>
    <family>sans-serif</family>
    <default>
      <family>Open Sans</family>
    </default>
  </alias>

Should probably also swap the families like so:

  <alias>
    <family>Open Sans</family>
    <default>
      <family>sans-serif</family>
    </default>
  </alias>

This Firefox bug seems relevant but I think this is a bug in the packaged font
configuration and really unrelated to Firefox (I didn't read the whole bug):
https://bugzilla.mozilla.org/show_bug.cgi?id=1245811

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