D23133: avoid duplicate notifications from showing up on Windows and remove whitespaces

[Kai Uwe Broulik]

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

REPOSITORY
  R289 KNotifications

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D23133

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