D20805: [Window Thumbnail] Also monitor scene visibility and clean up

[David Edmundson]

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

REPOSITORY
  R242 Plasma Framework (Library)

REVISION DETAIL
  https://phabricator.kde.org/D20805

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