[issue3399] rollback doesn't restore graft state

[Antoine Pitrou]

New submission from Antoine Pitrou <pitrou at free.fr>:

When you successfully graft a changeset and then call rollback, you can't
graft again:

$ hg graft -c
abandon : no graft state found, can't continue

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messages: 19748
nosy: pitrou
priority: bug
status: unread
title: rollback doesn't restore graft state

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