D26888: work around to fully support the windows backend

[Piyush Aggarwal]

brute4s99 added reviewers: vonreth, broulik, KDE Connect.

REPOSITORY
  R289 KNotifications

REVISION DETAIL
  https://phabricator.kde.org/D26888

To: brute4s99, vonreth, broulik, #kde_connect
Cc: kde-frameworks-devel, LeGast00n, GB_2, michaelh, ngraham, bruns