D27035: [KMessageWidget] Draw it with QPainter instead of using stylesheet

[David Redondo]

davidre edited the test plan for this revision.

REPOSITORY
  R236 KWidgetsAddons

REVISION DETAIL
  https://phabricator.kde.org/D27035

To: davidre, #frameworks
Cc: kde-frameworks-devel, LeGast00n, GB_2, michaelh, ngraham, bruns