[Fontconfig-bugs] [Bug 101350] New: Erroneous test on language id in FcLangSetPromote()

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=101350

            Bug ID: 101350
           Summary: Erroneous test on language id in FcLangSetPromote()
           Product: fontconfig
           Version: 2.12
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: library
          Assignee: fontconfig-bugs at lists.freedesktop.org
          Reporter: f.rougon at free.fr
        QA Contact: freedesktop at behdad.org

Created attachment 131803
  --> https://bugs.freedesktop.org/attachment.cgi?id=131803&action=edit
Commit (as output by 'git format-patch')

As written at:
https://lists.freedesktop.org/archives/fontconfig/2017-June/005942.html

FcLangSetIndex() indicates "not found" with a non-negative return value.
Return value 0 doesn't imply "not found", it rather means "language
found at index 0 in fcLangCharSets". See attached patch for the
precise location.

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