Editing area keyboard navigation problem with table in FF3

[Damian]

Steps to reproduce:

1. Open Ajax sample
   
2. Go to Source mode and remove all content
   
3. Go back to RTE
   
4. Add new table with default values.
   
5. Delete trailing <p> so that the table is the last element in the document
   
6. Attempt to add further text after the table
   

Actual result:
It is not possible to focus outside the table at the end of the document.

This works well in IE 7.

[Garry Yao]

It should be guaranteed that there's always an editable element following a table at the end of document, that's been reported at #3189.