D16082: Notify headphone being plugged in on some hardware

[Thomas Surrel]

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

REVISION SUMMARY
  On my computer, plugging the headphones in and out does not create
  a sink change but only a port change within the audio 'build-in' sink.
  
  I don't know if many users are in the same case, but this patch brings
  back the OSD notifier.
  
  I don't know if what I did is the right approach, comments are welcomed.

TEST PLAN
  Buy a Lenovo T470s :)
  Plug headphones in and enjoy the nice icon on the OSD.

REPOSITORY
  R115 Plasma Audio Volume Applet

BRANCH
  arc_ports (branched from master)

REVISION DETAIL
  https://phabricator.kde.org/D16082

AFFECTED FILES
  applet/contents/ui/main.qml
  src/device.h
  src/pulseaudio.cpp

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