id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc	blockedby	blocking	notify_on_close	platform	project
465	atomic Collection.subtract() does not preserve element order	Tom Goddard	Tom Goddard	Subtracting collections of chains, residues, atoms does not preserve order of elements because the numpy setdiff1d() method does not preserve order (it sorts).  Probably order should be preserved.  Eric needed this for multiple chains in matchmaker.  Write a C++ routine to do the subtract preserving order by making a set out of the second array and iterating in order over the first array.	enhancement	closed	major		Core		fixed		pett@…				all	ChimeraX