def clear(self):
# We can't call super().clear() because it runs the more efficient
# `self._listbox.body[:] = ()`
# That doesn't work here because urwidtrees.TreeListWalker doesn't
# support item assignment.
self._listbox.body = urwid.SimpleListWalker([])
self._listbox._invalidate()
self._initialized = False
self._table.clear()
self._marked.clear()
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