id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
20098	[Patch] Corrupted undo/redo stack after unsuccesful undo	GerdP	GerdP	"See ticket:20091#comment:10
Use steps 1-8 and 
9. Open relation editor, delete member 326046223
10. Close relation editor to save changes
11. undo -> Shows Bug Report , ignore

At this point, the undo/redo stack dialog still shows the ""change relation"" command but `UndoRedoHandler` has just removed it. Means dialog and data structure are out of sync and further undo or redo actions will give very confusing results.
"	defect	closed	major	20.12	Core		fixed