D11740: ktooltipwidget: Subtract margins from available size

[Elvis Angelaccio]

elvisangelaccio accepted this revision as: elvisangelaccio.

REPOSITORY
  R236 KWidgetsAddons

REVISION DETAIL
  https://phabricator.kde.org/D11740

To: michaelh, #frameworks, elvisangelaccio
Cc: elvisangelaccio, cfeck, michaelh, ngraham