D20967: [UserMetaData] Add method to query which attributes are set

[Stefan Brüns]

bruns marked 6 inline comments as done.

REPOSITORY
  R286 KFileMetaData

REVISION DETAIL
  https://phabricator.kde.org/D20967

To: bruns, #baloo, #frameworks, astippich, ngraham
Cc: arrowd, #freebsd, #windows, kde-frameworks-devel, LeGast00n, domson, ashaposhnikov, michaelh, astippich, spoorun, ngraham, bruns, abrahams
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