D10518: Use QWidget to see if the window is visible

[Aleix Pol Gonzalez]

apol created this revision.
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REVISION SUMMARY
  Instead of using KWindowInfo::mappingState that won't give reliable
  information about the window on wayland.

TEST PLAN
  tested locally

REPOSITORY
  R289 KNotifications

BRANCH
  master

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

AFFECTED FILES
  src/kstatusnotifieritem.cpp

To: apol, #frameworks
Cc: michaelh
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