D10901: Add "move to device" functionality to hamburger menu

[Christian]

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

REVISION SUMMARY
  This patch adds the possibility to choose a device for a playback / recording stream in the hamburger menu. 
  As per the discussion with the developers, the drag & drop functionality stays untouched and is still available.
  
  This is added to be a bit more consistent with the kcm and to make the functionality easier to discover.
  
  The menu is only shown when there are more than one possibilities to choose from in order to not confuse users.

TEST PLAN
  Apply patch.
  Have multiple output and input devices. 
  Move streams between devices and see if it works.

REPOSITORY
  R115 Plasma Audio Volume Applet

REVISION DETAIL
  https://phabricator.kde.org/D10901

AFFECTED FILES
  applet/contents/ui/ListItemBase.qml

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