[Fontconfig-bugs] [Bug 81185] New: FcConfigSubstitute() sets FC_LANG which is sometimes undesirable

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=81185

          Priority: medium
            Bug ID: 81185
          Assignee: fontconfig-bugs at lists.freedesktop.org
           Summary: FcConfigSubstitute() sets FC_LANG which is sometimes
                    undesirable
        QA Contact: freedesktop at behdad.org
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: freedesktop at behdad.org
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: library
           Product: fontconfig

See my analysis here:

  https://code.google.com/p/chromium/issues/detail?id=392724

I suggest that we check FC_LANG first, if it has the language "und" (BCP 47 for
"undetermined"), then do NOT add locale languages to FC_LANG.

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