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| tree-root |
<-display_root.
Class tree delegates
messages not understood to its tree<-root
node when present.
If the argument is *nil, all nodes are removed from the tree. If the
argument is a new root object the behaviour depends on the relink
argument. With relink = @off
(default), the tree is first cleared using tree->root: @nil,
after which the new root is attached. With relink = @on
the old root is added as the only node->son
of the new root.
See also tree->zoom
and tree->unzoom.
-display_root