D11098: use opacity instead of visible

[David Edmundson]

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

REPOSITORY
  R119 Plasma Desktop

BRANCH
  phab/kickoffover

REVISION DETAIL
  https://phabricator.kde.org/D11098

To: mart, #plasma, davidedmundson
Cc: plasma-devel, ZrenBot, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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