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sankhesh authored
The expansion states of hierarchy nodes are saved and restored when the tree view is updated. Save weak references to expanded nodes to avoid any dangling references at the end. Access children using model API and not MRML API Moved recursive children expand state save method to P-implementation. This fixes issue 2557. git-svn-id: http://svn.slicer.org/Slicer4/trunk@21523 3bd1e089-480b-0410-8dfb-8563597acbee
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