D22320: Hide "Dummy Output" from output list and improve user-visible labels

[Kai Uwe Broulik]

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

REVISION SUMMARY
  We already show a "muted" icon and disallow adjusting the "Dummy Output" volume through mouse wheeling the icon and global shortcuts. This patch also hides it from the applet as effectively the user has "no output devices". Also, the user-visible label for output switching is changed to be more friendly.
  The KCM still shows the "Dummy Output" as it is a more advanced settings menu as it is.

TEST PLAN
  Disabling all outputs / unplugging the last output device
  OSD
  F6990067: Screenshot_20190708_110535.png <https://phabricator.kde.org/F6990067>
  in applet
  F6990069: Screenshot_20190708_110509.png <https://phabricator.kde.org/F6990069>

REPOSITORY
  R115 Plasma Audio Volume Applet

REVISION DETAIL
  https://phabricator.kde.org/D22320

AFFECTED FILES
  applet/contents/ui/main.qml

To: broulik, #plasma, #vdg, drosca, nicolasfella
Cc: plasma-devel, LeGast00n, jraleigh, fbampaloukas, GB_2, ragreen, Pitel, ZrenBot, himcesjf, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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