D15194: Draw a line separating PlasmaComponents tab bar from its content area

[Nathaniel Graham]

ngraham added a reviewer: VDG.

REPOSITORY
  R242 Plasma Framework (Library)

REVISION DETAIL
  https://phabricator.kde.org/D15194

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