D19910: Hide the phonon widget when preview gets disabled

[Méven Car]

meven edited the test plan for this revision.

REPOSITORY
  R318 Dolphin

REVISION DETAIL
  https://phabricator.kde.org/D19910

To: meven, #dolphin, elvisangelaccio, ngraham
Cc: kfm-devel, alexde, feverfew, spoorun, navarromorales, firef, andrebarros, emmanuelp, mikesomov
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