D15724: Wait for duration to be known before registering player

[Kai Uwe Broulik]

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

REVISION SUMMARY
  A player might emit a `play` signal before its `duration` is known.
  We want to avoid controlling short sounds (e.g. chat notifications) but I found the `duration` often is `NaN` on first invication when the sound is loaded for the first time.
  Defer activating the player until we get a `durationchange` event for that player

TEST PLAN
  - No longer have it trying to control Facebook Messenger notification sounds
  - YouTube still works fine
  - Some random music stream (`duration` of `Infinity`) still works
  - HTML Media sessions example (both video and audo) still work fine

REPOSITORY
  R856 Plasma Browser Integration

REVISION DETAIL
  https://phabricator.kde.org/D15724

AFFECTED FILES
  extension/content-script.js

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