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@…