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finetjul authored
Give more flexibility to decide what item is root. A root index for QTreeView is the invisible index that is the parent of all the top level indexes. showScene or showRootNode give the option to decide if the root scene/node is visible, which implies that its parent becomes the root index for QTreeView. git-svn-id: http://svn.slicer.org/Slicer4/trunk@21536 3bd1e089-480b-0410-8dfb-8563597acbee
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