D26786: Port away from deprecated QList::toSet() method

[David Faure]

dfaure accepted this revision.
This revision is now accepted and ready to land.

REPOSITORY
  R286 KFileMetaData

BRANCH
  l-toset (branched from master)

REVISION DETAIL
  https://phabricator.kde.org/D26786

To: ahmadsamir, dfaure, apol, bruns
Cc: kde-frameworks-devel, #baloo, hurikhan77, lots0logs, LeGast00n, fbampaloukas, GB_2, domson, ashaposhnikov, michaelh, astippich, spoorun, ngraham, bruns, abrahams
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