FF/Chrome: Paragraphs go nuts after modifying copy-pasted text

[Jude Allred]

This bug was discovered as a user attempted to manipulate some copy-pasted song lyrics. Here's an excerpt of the source that was generated by the paste:

<p>
    Big wheels keep on turning,<br />
    carry me home to see my kin<br />
    singing songs about the southland.<br />
    I miss ole bamy once again and I think it&#39;s a sin.<br />
    Well, I heard Mister Young sing about her.<br />
    Well, I heard ole Neil put her down.<br /></p> 

Steps:

1. go to ckeditor.com/demo
2. set the source to the code snippet above
3. return to wysiwyg mode

now...

In Firefox:

1. Go to the end of the Nth line (where N > 1)
2. Hit Enter
3. Hit Backspace
4. Hit Shift + Enter
5. [Bug] Watch first line disappear and cursor jump to top

In Chrome:

1. Go to the end of the Nth line (where N > 1)
2. Hit Enter
3. Hit Backspace
4. Hit Shift + Enter
5. You are now unable to get rid of your newly created paragraphs