D14970: [MPris Dataengine] Avoid blocking calls in media shortcuts handling

[Kai Uwe Broulik]

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

REVISION SUMMARY
  All the information we need (player capabilities and playback status) is already present and managed by the `PlayerContainer`
  
  BUG: 397685
  FIXED-IN: 5.13.5

TEST PLAN
  Started VLC, ran `killall -SIGSTOP vlc`, pressed "Pause" on my keyboard, plasma would no longer freeze
  Back, forward, pause keys still work fine

REPOSITORY
  R120 Plasma Workspace

REVISION DETAIL
  https://phabricator.kde.org/D14970

AFFECTED FILES
  dataengines/mpris2/multiplexedservice.cpp
  dataengines/mpris2/playercontrol.h

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