State switching does not always happen when opening a new media source

[beshur]

Steps to reproduce:

1. Start some player (Youtube e.g.)
2. Start another player (another Youtube e.g.)

Actual:
Playback 1 stops, player 2 plays, but the StoPlay button is in Idle mode.
Expected:
Playback 1 stops, player 2 plays, but the StoPlay button reflects actual state - playing (pause button is seen).

[NffS]

The problem is that provider is sending "paused" event after we've received "playing" event. Possible solution is send "playing" event every second while provider is playing.