D8243: Implement support for categories on KfilesPlacesView

[Franck Arrecot]

franckarrecot added a dependent revision: D8367: Hidding place groups 
implementation in KFilePlacesModel.

REPOSITORY
  R241 KIO

REVISION DETAIL
  https://phabricator.kde.org/D8243

To: renatoo, #frameworks, dfaure, ervin, #vdg
Cc: markg, ngraham, mlaurent, ervin, anthonyfieroni, cfeck, #frameworks