[issue2509] localrepository._filecommit uses workinctx.ancestors() instead of the parents ancestors

[RonnyPfannschmidt]

New submission from RonnyPfannschmidt <Ronny.Pfannschmidt at gmx.de>:

this break memctx based commiting if the workingctx parent is the nullrev or 
a waay too early ancestor

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messages: 14458
nosy: RonnyPfannschmidt
priority: urgent
status: unread
title: localrepository._filecommit uses workinctx.ancestors() instead of the parents ancestors

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Mercurial issue tracker <bugs at mercurial.selenic.com>
<http://mercurial.selenic.com/bts/issue2509>
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