D11356: [Media Controller] Show track length if available even if seeking isn't possible

[Kai Uwe Broulik]

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

REVISION SUMMARY
  When seeking isn't possible but the track duration is known, show a progress bar instead of showing nothing.
  A progress bar is also much nicer than a disabled slider here as it's then meant as an indicator instead.

TEST PLAN
  Disabled slider:
  F5755038: Screenshot_20180315_162409.png <https://phabricator.kde.org/F5755038>
  Progress bar (this patch)
  F5755039: Screenshot_20180315_162240.png <https://phabricator.kde.org/F5755039>
  
  - Verified that it is not shown when streaming music where length isn't known

REPOSITORY
  R120 Plasma Workspace

REVISION DETAIL
  https://phabricator.kde.org/D11356

AFFECTED FILES
  applets/mediacontroller/contents/ui/ExpandedRepresentation.qml

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