Bug - List elements are reversed with deep lists

[Risord]

Are you reporting a feature or a bug?

Bug

Provide detailed reproduction steps (if any)

1. Put code to editor (standard demo is fine)

<ol>
	<li>x: press delete there -&gt;
	<ol>
		<li>&lt;- y: or backspace there
		<ol>
			<li>A</li>
			<li>B</li>
		</ol>
		</li>
	</ol>
	</li>
</ol>

2. Remove one list level by pressing delete at the end of x line or backspace at begin of y line.

Expected result

1. x: press delete there -><- y: or backspace there
   1. A
   2. B

Actual result

Deepest list is reversed.

1. x: press delete there -><- y: or backspace there
   1. B
   2. A

Other details

• Browser: Chrome 58, Firefox 53, Edge 14
• OS: Windows 10 64
• CKEditor version: 4.5.9, 4.7.0, nightly
• Installed CKEditor plugins: Just standard set

[beatadelura]

The issue can be reproduced in all browsers starting from 4.3.0 version.

[engineering-this]

This report is valid. However it was duplicated by #2721, but as discussion is there I will close this one just to continue work there. So whoever is interested on updates please check #2721.