D12083: Show OSD when default output changes

[Kai Uwe Broulik]

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

REVISION SUMMARY
  When the default output changes because a device is plugged in or a Bluetooth headset is connected, show an OSD so the user knows when/that the device is ready to use.

TEST PLAN
  Turned on my Bluetooth headset, took a second two connect (Bluetooth Icon shows dots), and then took another couple of seconds for PulseAudio to recognize the device and then the OSD showed up.
  If a device icon is available (e.g. headset) it is shown, otherwise the volume icon (using the correct icon depending on volume) shows up:
  F5802585: Screenshot_20180410_123739.png <https://phabricator.kde.org/F5802585>
  F5802580: Screenshot_20180410_123511.png <https://phabricator.kde.org/F5802580>
  
  - Verified that no OSD is shown on startup (the default changes once from none to whatever is the default)
  - Verified that no OSD is shown when user explicitly changes the Default in the applet
  - Did not test what happens if I plug in headphone jack (where the profile on the same device changes from speaker to headphones)
  - Changing output configuration in volume settings might spawn the OSD when you disable/enable a device that used to be a default at one point
  
  There's a setting in the applet, default is enabled:
  F5802577: Screenshot_20180410_123345.png <https://phabricator.kde.org/F5802577>

REPOSITORY
  R115 Plasma Audio Volume Applet

REVISION DETAIL
  https://phabricator.kde.org/D12083

AFFECTED FILES
  applet/contents/code/icon.js
  applet/contents/config/main.xml
  applet/contents/ui/ConfigGeneral.qml
  applet/contents/ui/DeviceListItem.qml
  applet/contents/ui/ListItemBase.qml
  applet/contents/ui/main.qml
  src/qml/dbus/osdService.xml
  src/qml/volumeosd.cpp
  src/qml/volumeosd.h

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