D10543: fix crashing with duplicate entries

[Martin Tobias Holmedahl Sandsmark]

sandsmark created this revision.
sandsmark added reviewers: dfaure, Frameworks.
Restricted Application added a project: Frameworks.
sandsmark requested review of this revision.

REVISION SUMMARY
  some zip files apparently can have duplicate entry names, which weren't handled correctly.

TEST PLAN
  created a unit test in a separate commit.

REPOSITORY
  R243 KArchive

REVISION DETAIL
  https://phabricator.kde.org/D10543

AFFECTED FILES
  src/karchive.cpp

To: sandsmark, dfaure, #frameworks
Cc: michaelh
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