[chrome] List gets destoryed after repetitive type changes

[tobiasz.cudnik]

In chromium, list gets destoryed after repetitive type changes. Refer to attached video TC.

[garry.yao]

With the help from Tobias, I was managed to find an even easier way to reproduce:

1. Load the following content with selection:

   <ul>
   	<li>
   		a
   		<ol>
   			<li>
   				b^
   				<ul>
   					<li>
   						c</li>
   				</ul>
   			</li>
   		</ol>
   	</li>
   </ul>
   
   

2. Press 'Numbered List' button and check the DOM snapshot;

• Expected Result:

  <ul>
  	<li>
  		a</li>
  	<li>
  		b
  		<ul>
  			<li>
  				c</li>
  		</ul>
  	</li>
  </ul>
  

• Actual Result:

  <ul>
  	<li>
  		a
          </li>
  	<li>
  		b
  	</li>
  		<ul>
  			<li>
  				c</li>
  		</ul>
  </ul>
  

So it's a general list bug instead of a webkit specific one.

[garry.yao]

I've expected the wrong output on previous comment, the correct result should be what we have in v2:

<ul>
	<li>
		a</li>
</ul>
<p>
	b</p>
<ul>
	<li>
		c</li>
</ul>

[garry.yao]

I hope it make sense also in the patch to trim text before <br>.

[garry.yao]

Ticket Test added at :
 http://ckeditor.t/tt/4196/1.html.
Fixed with [4523].