node's children to node. The children of node are pulled off the view and node is added to the view. Fails if node is already in the view of if node don't have any children. Meta edges are automatically updated.
@param node the nodes' parent to be retracted
@return true if the expand succeed or false if not
@throws IllegalArgumentException if node is null or not legal in the graph
@throws IllegalMonitorStateException if the current thread is holding a read lock
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