D20374: [KNotifications] Update when flags, urls, or urgency change

[Volker Krause]

vkrause accepted this revision.
This revision is now accepted and ready to land.

REPOSITORY
  R289 KNotifications

REVISION DETAIL
  https://phabricator.kde.org/D20374

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