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def show_diff(self, item):
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from bzrlib.plugins.gtk.diff import DiffWindow
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window = DiffWindow(parent=self.parent)
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rev_tree = self.repository.revision_tree(self.revids[0])
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parent_tree = self.repository.revision_tree(parentid)
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window.set_diff(self.revids[0], rev_tree, parent_tree)