id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc	blockedby	blocking	notify_on_close	platform	project
2869	incorrect undo of roll specific model	Elaine Meng	Conrad Huang	"The attached session square-assembly.cxs has two models #2.1 and #2.2 making up a square assembly.  The session restore position is a view named ""middle"". Session made/tested in UCSF ChimeraX version: 0.92 (2020-02-20)

All of the following commands undo perfectly, as can be assessed by executing them, and then ""undo"", and then ""view middle"" (which should not cause any change).

turn y 90
roll y 90 1
turn y 90 models #2.1

However, this one does not undo back to the previous position:

roll y 90 1 models #2.1

After the ""undo"" the square is not square, and ""view middle"" changes noticeably to get you back to the square.

Maybe the difference is not roll vs. turn but the inclusion of a frame argument? "	defect	closed	moderate		Undo/Redo		fixed		Eric Pettersen Tom Goddard				all	ChimeraX