shelve: restore unshelved dirstate explicitly after aborting transaction
Before this patch, "hg unshelve" uses aborting a current transaction to discard temporary changes while unshelving. This assumes that dirstate changes in a transaction scope are kept even after aborting it. But this assumption will be broken by "transactional dirstate". See the wiki page below for detail about it. https://mercurial.selenic.com/wiki/DirstateTransactionPlan This patch explicitly saves shelved dirstate just before aborting current transaction, and restore dirstate with it after aborting by utility function '_aborttransaction()' added by previous patch.
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