D29292: Port KKeySequenceItem to QQC2

[Nathaniel Graham]

ngraham added a reviewer: davidre.

REPOSITORY
  R296 KDeclarative

REVISION DETAIL
  https://phabricator.kde.org/D29292

To: davidedmundson, #plasma, davidre
Cc: cblack, broulik, kde-frameworks-devel, LeGast00n, michaelh, ngraham, bruns