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	candidates = _refinedgroups(revlog, p1, p2, cachedelta)			candidates = _refinedgroups(revlog, p1, p2, cachedelta)
	while True:			while True:
	temptative = candidates.send(good)			temptative = candidates.send(good)
	if temptative is None:			if temptative is None:
	break			break
	group = []			group = []
	for rev in temptative:			for rev in temptative:
	# skip over empty delta (no need to include them in a chain)			# skip over empty delta (no need to include them in a chain)
	while not (rev == nullrev or rev in tested or deltalength(rev)):			while (revlog._generaldelta
				and not (rev == nullrev
				or rev in tested
				or deltalength(rev))):
	tested.add(rev)			tested.add(rev)
	rev = deltaparent(rev)			rev = deltaparent(rev)
	# filter out revision we tested already			# filter out revision we tested already
	if rev in tested:			if rev in tested:
	continue			continue
	tested.add(rev)			tested.add(rev)
	# filter out delta base that will never produce good delta			# filter out delta base that will never produce good delta
	if deltas_limit < revlog.length(rev):			if deltas_limit < revlog.length(rev):

delta: skip "empty delta" optimisation for non-general case (issue6006)ClosedPublic