D17350: Add the missing api for multilevel KCMs to control the columns

[Nathaniel Graham]

ngraham added a comment.


  That plasma-nm QML rewrite is looking totally awesome! How soon can we get it committed?

REPOSITORY
  R296 KDeclarative

REVISION DETAIL
  https://phabricator.kde.org/D17350

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