D14156: Show "muted" icon for dummy output

[Kai Uwe Broulik]

broulik created this revision.
broulik added reviewers: Plasma, drosca.
Restricted Application added a project: Plasma.
Restricted Application added a subscriber: plasma-devel.
broulik requested review of this revision.

REVISION SUMMARY
  Dummy output cannot play any sound

TEST PLAN
  Disconnected my headphones, got "Dummy Output" with muted icon in OSD

REPOSITORY
  R115 Plasma Audio Volume Applet

REVISION DETAIL
  https://phabricator.kde.org/D14156

AFFECTED FILES
  applet/contents/ui/main.qml

To: broulik, #plasma, drosca
Cc: plasma-devel, ragreen, Pitel, ZrenBot, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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