D23388: add a border for the toolbars WIP

[Björn Feber]

GB_2 added a comment.


  Ping.

REPOSITORY
  R242 Plasma Framework (Library)

REVISION DETAIL
  https://phabricator.kde.org/D23388

To: camiloh, #plasma, mart, ngraham, apol
Cc: GB_2, kde-frameworks-devel, LeGast00n, michaelh, ngraham, bruns