D5583: [Lock Screen] Show Previous/Next buttons only if supported

[Kai Uwe Broulik]

broulik created this revision.
Restricted Application added a project: Plasma.
Restricted Application added a subscriber: plasma-devel.

REVISION SUMMARY
  If the user can neither go back nor forward, hide those controls for a cleaner look.

TEST PLAN
  If one action (e.g. only "Next" is supported), both buttons are shown with the Back button grayed out. But for the case of a simple stream or so where really only play/pause is supported, it makes it much cleaner:
  F3734636: Screenshot_20170425_174729.png <https://phabricator.kde.org/F3734636>
  
  (I initially did this for Task manager but here I found it looked odd with the tiny lost play icon F3734638: Screenshot_20170425_174546.png <https://phabricator.kde.org/F3734638>

REPOSITORY
  R120 Plasma Workspace

REVISION DETAIL
  https://phabricator.kde.org/D5583

AFFECTED FILES
  lookandfeel/contents/lockscreen/MediaControls.qml

To: broulik, #plasma, #vdg
Cc: plasma-devel, spstarr, progwolff, Zren, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, lukas
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