D17543: [Dialog] Don't alter mainItem's visibility

[Marco Martin]

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

REPOSITORY
  R242 Plasma Framework (Library)

REVISION DETAIL
  https://phabricator.kde.org/D17543

To: broulik, #plasma, mart
Cc: kde-frameworks-devel, michaelh, ngraham, bruns