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gh-159706: Fix pure-Python ZoneInfo.fromutc() fold detection for single-transition zones - #159828
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…r single-transition zones
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In the pure-Python fromutc(), a zone with exactly one transition takes the timestamp > self._trans_utc[-1] branch, which used self._ttinfos[-1] (the offset after the transition) as tti_prev. That made the shift zero, so times in the fold got fold=0. This uses self._tti_before like the C implementation does, and adds a test.