brittle style support

[Garret Wilson]

In Firefox 3 I start with the following text:

<h2>this is interesting</h2> <p>123</p>

I select "interesting" and add <code> around it:

<h2>this is <code>interesting</code></h2> <p>123</p>

Then I go to the end of "interesting", hit "End", and backspace and type and backspace and type a few times. I get this:

<h2>this is <code>inter<span style="font-family: Arial,Verdana,sans-serif;">esting</span></code></h2> <p>123</p>

Bad, bad, and broken.