D20865: [TagsFileItemAction] Avoid readding an existing tag via "New tag..."

[Nicolas Fella]

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

REPOSITORY
  R824 Baloo Widgets

BRANCH
  tagsfileaction

REVISION DETAIL
  https://phabricator.kde.org/D20865

To: bruns, #baloo, #dolphin, nicolasfella, ngraham, elvisangelaccio
Cc: gennad, domson, ashaposhnikov, astippich, spoorun, abrahams
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