[Bug 1707734] New: fc-validate should return non-zero value when missing glyph for language coverage

https://bugzilla.redhat.com/show_bug.cgi?id=1707734

            Bug ID: 1707734
           Summary: fc-validate should return non-zero value when missing
                    glyph for language coverage
           Product: Fedora
           Version: rawhide
            Status: NEW
         Component: fontconfig
          Assignee: tagoh(a)redhat.com
          Reporter: pwu(a)redhat.com
        QA Contact: extras-qa(a)fedoraproject.org
                CC: ajax(a)redhat.com, caillon+fedoraproject(a)gmail.com,
                    fonts-bugs(a)lists.fedoraproject.org,
                    gnome-sig(a)lists.fedoraproject.org,
                    i18n-bugs(a)lists.fedoraproject.org,
                    john.j5live(a)gmail.com, mclasen(a)redhat.com,
                    pnemade(a)redhat.com, rhughes(a)redhat.com,
                    rstrode(a)redhat.com, sandmann(a)redhat.com,
                    tagoh(a)redhat.com
  Target Milestone: ---
    Classification: Fedora



Description of problem:
When use fc-validate to check missing glyph for language coverage,
if some glyphs are missing, fc-validate still returns zero value.


Version-Release number of selected component (if applicable):
fontconfig-2.13.1-3.fc29.x86_64


How reproducible:
Run fc-validate -l zh_cn
/usr/share/fonts/google-noto-cjk/NotoSansCJK-Regular.ttc
and fc-validate -l th /usr/share/fonts/google-noto-cjk/NotoSansCJK-Regular.ttc

Steps to Reproduce:
1. run fc-validate against some fonts which missing glyph coverage


Actual results:
fc-validate returns zero value.

Expected results:
fc-validate returns non-zero value if any font face missing glyph coverage.

Additional info:

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