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tests: add a case for issue6550 where s0 has no topic stable
Tue, 11 Jan 2022 08:19:53 +0300, by Anton Shestakov
topic: also make histedit clear the current topic if needed stable
Fri, 07 Jan 2022 18:06:46 +0100, by Simon Sapin
topic: wrap applychange from histedit to preserve topics stable
Fri, 07 Jan 2022 17:52:34 +0100, by Simon Sapin

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