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finetjul authored
the difference is that it observes the node and update the root index accordingly. During the lifetime of a node, it can change of model index multiple times (e.g. reparented). Add utility functions for next commit. git-svn-id: http://svn.slicer.org/Slicer4/trunk@19119 3bd1e089-480b-0410-8dfb-8563597acbee
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