[Bug 1820166] New: Droid sans overrides my default CJK font

https://bugzilla.redhat.com/show_bug.cgi?id=1820166

Bug ID: 1820166
           Summary: Droid sans overrides my default CJK font
           Product: Fedora
           Version: 32
            Status: NEW
         Component: google-droid-fonts
          Severity: low
          Assignee: [e-mail]
          Reporter: [e-mail]
        QA Contact: [e-mail]
                CC: [e-mail],
                    [e-mail], [e-mail],
                    [e-mail], [e-mail]
  Target Milestone: ---
    Classification: Fedora

Description of problem:

I have this (per-user) fontconfig configuration to set my preferred sans-serif
font:

<alias>
    <family>sans-serif</family>
    <prefer>
      <family>Noto Sans</family>
      <family>Noto Sans CJK SC</family> 
    </prefer>
  </alias>

It should fall back to "Noto Sans CJK SC" when displaying CJK characters. Since
F32 this isn't working anymore. CJK characters are rendered in a different
font, which I cannot recognize.

Digging through fc_debug logs, "Droid Sans" is appended right after "Noto
Sans", before "Noto Sans CJK SC" in the font matching list. Debug messages
confirm it's indeed Droid Sans getting picked.

Removing the relevant part in /etc/fonts/conf.d/65-google-droid-sans-fonts.conf
mitigates this issue. However since both Noto Sans & Droid Sans do not contain
CJK characters, they should both be skipped in favor of CJK fonts. Could this
be a metadata problem? i.e. Droid Sans wrongly advertises as CJK capable.

Version-Release number of selected component (if applicable):
google-droid-sans-fonts-20200215-3.fc32.noarch