D6666: Allow having a header in a ListView that is in an OverlaySheet

[Marco Martin]

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

REPOSITORY
  R169 Kirigami

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D6666

To: apol, #kirigami, mart
Cc: plasma-devel, apol, mart