D8330: Open files in TagLib extractor readonly

[David Kahles]

davidk created this revision.
Restricted Application added a project: Frameworks.
Restricted Application added a subscriber: Frameworks.

REVISION SUMMARY
  This is useful if the extractor runs sandboxed, and read-write file access is denied.
  TagLib would retry it readonly, but this saves one syscall.

TEST PLAN
  - Autotests run fine
  - Tags are still indexed, tested with "baloosearch artist=..." and "baloosearch genre=..."

REPOSITORY
  R286 KFileMetaData

BRANCH
  readOnly

REVISION DETAIL
  https://phabricator.kde.org/D8330

AFFECTED FILES
  src/extractors/taglibextractor.cpp

To: davidk
Cc: #frameworks
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