am 88e03757: RotarySelector widget: add callback for "grabbed" state changes.

Merge commit '88e037577f7db140e4ef88b77eefaa910e06e5f5' into eclair-mr2

* commit '88e037577f7db140e4ef88b77eefaa910e06e5f5':
  RotarySelector widget: add callback for "grabbed" state changes.