id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
16436	Undo doesn't work properly	Duskfall		"== Steps to reproduce ==

1. Open http://ckeditor.com/demo
2. Clear all text inside
3. Type a small text like ""test""
4. Select the ""test text and copy it Ctrl + C
5. Paste the selected text multiple times. At lease 4-5 lines
6. Undo the input by pressing Ctrl + Z

== Expected result ==
Undo all text

== Actual result ==
The text is not undoed completely only partially

== Other details (browser, OS, CKEditor version, installed plugins) ==
Tested on Firefox 49.0.1, Chrome 52.0.2743.116 m (64-bit) and IE 11
"	Bug	closed	Normal		Core : Undo & Redo		invalid	undo