shelve: widen wlock scope of unshelve for consistency while processing Before this patch, "hg unshelve" of shelve extension executes below before acquisition of wlock: - cmdutil.checkunfinished() - examine existence of (specified) shelve file It may cause unintentional result, if another command runs parallelly (see also issue4368). This patch widens wlock scope of "hg unshelve" of shelve extension for consistency while processing.