D25403: Drop Position change signal and support Seeked signal

[Kai Uwe Broulik]

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

REVISION SUMMARY
  When user seeks, emit `Seeked` signal. The signal is periodically emitted while seeking and once again when seeking finishes (user releases mouse).
  The `Position` property explicitly isn't signalled as per specification.

TEST PLAN
  - Moved the seek slider in a video, got the `Seeked` signal emitted every 250ms, and once again when mouse got released.
  - Position of slider in media controller applets seems consistent

REPOSITORY
  R856 Plasma Browser Integration

REVISION DETAIL
  https://phabricator.kde.org/D25403

AFFECTED FILES
  host/mprisplugin.cpp
  host/mprisplugin.h

To: broulik, #plasma, fvogt
Cc: plasma-devel, LeGast00n, The-Feren-OS-Dev, jraleigh, fbampaloukas, GB_2, ragreen, ZrenBot, ngraham, alexeymin, himcesjf, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, ahiemstra, mart
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