shelve: widen wlock scope of shelve for consistency while processing Before this patch, "hg shelve" of shelve extension executes/refers below before acquisition of wlock: - 'repo.dirstate.parents()' via 'repo[None].parents()' - 'repo._activebookmark' It may cause unintentional result, if another command runs parallelly (see also issue4368). This patch widens wlock scope of "hg shelve" of shelve extension for consistency while processing.