Prevent the tinymce editor from rewriting the html

when i switch to html view and enter html directly, the editor rewrites it.

example:

i enter:

<div><div>title</div><div>body</div></div>

the editor writes it to:

<div>title</div>

seems it removes the inner div's


This is a companion discussion topic for the original entry at https://our.umbraco.com/forum/6493-prevent-the-tinymce-editor-from-rewriting-the-html