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warnings.warn(gettext("pb parameter to convert() is deprecated"))
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with ui.ui_factory.nested_progress_bar() as self.pb:
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ui.ui_factory.note(gettext('starting upgrade from format 4 to 5'))
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if isinstance(self.controldir.transport, local.LocalTransport):
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self.controldir.get_workingtree_transport(None).delete('stat-cache')