Assume a snapshot state with three speakers in two groups, AB and C. They will
be playing the A and C queues, respectively. The B queue exists but is hidden
in this topology.
Unjoin B and form a new group BC, playing the B queue (now with the C queue
hidden).
To restore the snapshot we would join B back to A. The BC group would now only
contain the C speaker, still playing the B queue. The C queue has been lost :-(
The problem is that unjoining a coordinator will elect a new coordinator that
inherits the group queue and thus has its hidden queue overwritten.
This commit avoids the situation by having restore unjoin all slaves. Above, C
would be unjoined before joining B to A. This restores the C queue and since B
is then alone, it can be joined to A without having to transfer its playing
queue to remaining speakers.
* Move more constants to const.py
* Import constants directly from const
* ATTR_ENTITY_ID is not defined in media_player
* MEDIA_PLAYER_PLAY_MEDIA_SCHEMA is still in __init__.py
* Correct imports in tts
* PLATFORM_SCHEMA, SCHEMA is still defined in __init__.py
* Pandora imports several services
* Some additional fixes for move of const in media_player
* Fix hound lengths
Anders Melchiorsen
Fabian Affolter
Joakim Plate
Paulus Schoutsen