D26221: Use QQC2 Dialog

[Carl Schwan]

ognarb added reviewers: Calligra: 3.0, leinir.

REPOSITORY
  R8 Calligra

REVISION DETAIL
  https://phabricator.kde.org/D26221

To: ognarb, #calligra:_3.0, leinir
Cc: Calligra-Devel-list, davidllewellynjones, dcaliste, ognarb, cochise, 
vandenoever