D6767: simplify setContents by letting Qt do more of the work

[David Edmundson]

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

REPOSITORY
  R236 KWidgetsAddons

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D6767

To: sitter, cfeck, davidedmundson
Cc: davidedmundson, #frameworks
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