- #630 when the event is null we're in silent seek during controlbar dragging, only seek when not silent.

Danielr core

- #614 when the clip ends if the next clip in the provider has a different provider close the provider stream.
- #627 only detach / attach the display on start events which causes issues in buffering events after a seek in stagevideo.
- #627 re-enable stagevideo state change listeners if stagevideo is available or detach the fullscreen events on first call.