D10518: Use QWidget to see if the window is visible

[Andrius Štikonas]

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

REPOSITORY
  R289 KNotifications

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D10518

To: apol, #frameworks, stikonas
Cc: stikonas, michaelh
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