[IE] XHTML namespace support broken

[garretwilson]

I have the following content:

<p xmlns="http://www.w3.org/1999/xhtml">this is interesting</p>

On Firefox 3 this shows in the source as:

<p>this is interesting</p>

So FCKeditor has stripped out the xmlns declaration. OK. But then I create an editor on IE7 with the same comment. The source shows:

<p xmlns="http://www.w3.org/1999/xhtml">this is interesting</p>

I then add the <em> tag around "is". This results in:

<p xmlns="http://www.w3.org/1999/xhtml">this <em xmlns="">is</em> interesting</p>

This breaks my content. It won't even show up in the browser, as FCKeditor has taken <em> out of the XHTML namespace.

[w.olchawa]

Confirmed using FCKeditor 2.6.3 beta and the latest SVN version in IE7. Works OK with FF.