Function reconcileChildren

lib/assets/react-source/development/react.js:20451–20466

(current, workInProgress, nextChildren, renderExpirationTime)

	}

	function reconcileChildren(current, workInProgress, nextChildren, renderExpirationTime) {
	  if (current === null) {
	    // If this is a fresh new component that hasn't been rendered yet, we
	    // won't update its child set by applying minimal side-effects. Instead,
	    // we will add them all to the child before it gets rendered. That means
	    // we can optimize this reconciliation pass by not tracking side-effects.
	    workInProgress.child = mountChildFibers(workInProgress, null, nextChildren, renderExpirationTime);
	  } else {
	    // If the current child is the same as the work in progress, it means that
	    // we haven't yet started any work on these children. Therefore, we use
	    // the clone algorithm to create a copy of all the current children.
	    // If we had any progressed work already, that is invalid at this point so
	    // let's throw it out.
	    workInProgress.child = reconcileChildFibers(workInProgress, current.child, nextChildren, renderExpirationTime);
	  }
	}

	function forceUnmountCurrentAndReconcile(current, workInProgress, nextChildren, renderExpirationTime) {
	  // This function is fork of reconcileChildren. It's used in cases where we