Line breaks in list items are lost when followed by another list

[wwalc]

Suppose someone has added a few line breaks with Shift+Enter to visually separate an indented list, like in the example below:

<ul>
	<li>
		test 1<br />
		<br />
		<br />
		<ul>
			<li>
				test 11</li>
			<li>
				test 12</li>
		</ul>
	</li>
</ul>

Switch to source/wysiwyg twice. Result: all line breaks are lost

<ul>
	<li>
		test 1
		<ul>
			<li>
				test 11</li>
			<li>
				test 12</li>
		</ul>
	</li>
</ul>

[garry.yao]

Ticket tc added with [7159].

[garry.yao]

Design TC updated: ​http://ckeditor.t/dt/plugins/htmldataprocessor/htmldataprocessor.html