grpc-js: exitIdle asynchronously in QueuePicker, only act in exitIdle if IDLE #1062
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This should fix #1061. Previously the
updateStatecall inexitIdlecould cause infinite recursion if there was a pending call, because theQueuePickerthere would callexitIdleagain. The change toexitIdleshould stop the loop, and the change to theQueuePickerwould make the loop non-recursive. It's probably just a good idea in general not to change the load balancer state while checking the picks of pending calls as a result of changing the load balancer state.