nodes
into a new node group (i.e. cluster). Creates an upper node in the tree and appends nodes
to it. Content of nodes
can be existing groups. In that case, nodes
must only contains roots of groups. Therefore all nodes in nodes
must have the same parent. The method returns the newly created group of nodes.
@param nodes the nodes to be grouped in a new group
@return the newly created group of nodes which contains nodes
and descendants of nodes
@throws IllegalArgumentException if nodes
is null
,or if nodes
is empty, or if content nodes are not legal in the graph, or if nodes
' parent is not similar between elements
@throws IllegalMonitorStateException if the current thread is holding a read lock
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