[Fontconfig-bugs] [Bug 101351] New: FcLangSetCompare() gives an incorrect result when two charsets come from different "buckets" of fcLangCountrySets

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=101351

            Bug ID: 101351
           Summary: FcLangSetCompare() gives an incorrect result when two
                    charsets come from different "buckets" of
                    fcLangCountrySets
           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 131804
  --> https://bugs.freedesktop.org/attachment.cgi?id=131804&action=edit
Commit (as output by 'git format-patch')

As written at:
https://lists.freedesktop.org/archives/fontconfig/2017-June/005944.html

In fcLangCountrySets, it may happen that two charsets for the same
language but different territories are found in different FcChar32
"buckets" (different "columns" on the same line). This is currently the
case for the following pairs:

  mn-cn  and mn-mn
  pap-an and pap-aw

The FcLangSetCompare() code in current 'master' returns
FcLangDifferentLang instead of FcLangDifferentTerritory when
comparing:

  an FcLangSet containing only mn-cn with one containing only mn-mn

or

  an FcLangSet containing only pap-an with one containing only pap-aw

The attached patch fixes this problem.

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