D12508: Make KMessageWidget match Kirigami inlineMessage's style

[Nathaniel Graham]

ngraham edited the test plan for this revision.

REPOSITORY
  R236 KWidgetsAddons

REVISION DETAIL
  https://phabricator.kde.org/D12508

To: ngraham, hein, #plasma, #vdg
Cc: #frameworks, michaelh, bruns