Dispatch overridden w/ side effects when child emits new program event.

If an event (event alpha) is currently being processed (i.e. the Breath First Search is ongoing) for a particular _program_ event via Dispatch, and a child node's (node X) handling of this event creates a _new_ program event (event beta) targeted at the path of its own node, then this event will 'take over' the event Dispatch, but keep the remaining children in the queue. This results in event beta being sent to the neighbours of node X and not simply its children.

The following JSBin demonstrates this problem: https://jsbin.com/toroqaheze/edit (needs local images, but effect can still be seen).

To reproduce:
1,2,3,4 will change the speed of spinning of each child, but 3 will emit a new event (.hide()) as well, this overrides the currently processed event (speedChange) and the 4th node's speed is not changed.

Gist is here: https://gist.github.com/anonymous/e9f45883faad8540ff66