id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
4672	Undo not removing added horizontal line	Joe Kavanagh	Garry Yao	"1. Enter some text.
2. Click the Insert Horizontal Line button.
3. Click the Undo button.

Observe that the horizontal line is not removed. Continuously clicking the Undo button will eventually remove the horizontal line."	Bug	closed	Normal	CKEditor 3.1	Core : Undo & Redo	3.0.1	fixed	IBM Confirmed Review+	dchojna@…