Indent on first LI of ordered list breaks the list

[Alvaro]

CK is deletting all but first list items in a ordered list after some formatting and increase indent.

Steps to reproduce using full demo

1) put this code in source

<ol>
	<li>
	<pre>
test</pre>
	</li>
	<li>
	<p>paragraph 1</p>
	</li>
	<li>item 3</li>
	<li>item 4</li>
	<li>item 5</li>
</ol>

2) go to wysiwig, select first li and increase indent
3) only the first list remains in document

[Jakub Ś]

#12141 was marked as duplicate.