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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