Fix undo after aborted commit bug Commit would overwrite undo.dirstate unconditionally, so an undo after an aborted commit would restore the dirstate from the aborted commit and not the prior transaction. This copies dirstate to journal.dirstate and moves it after a successful transaction.

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#!/bin/sh

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set -x

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hg init

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echo "nothing" > a

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hg add a

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hg commit -m ancestor -d "0 0"

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echo "something" > a

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hg commit -m branch1 -d "0 0"

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hg co 0

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echo "something else" > a

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hg commit -m branch2 -d "0 0"

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export HGMERGE=merge

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hg up -m 1

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hg id

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grep -Ev ">>>|<<<" a

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hg status