<hr/> elements inside <p></p> with ie6 still occuring in 2.4.2

[Paul Wilton]

In IE6, if a simple <hr/> is added, and some text typed afterwards, the markup generated is not valid XHTML, as the <hr/> is inserted into <p><hr/></p>

This appeared to have been fixed with ticket 202 (​http://dev.fckeditor.net/ticket/202), but it still occurs in 2.4.2

This is easily repeatable in wysiwyg mode using the demo page in IE6 as follows: Enter an <hr> using toolbar. Hit enter. type some text. The resulting (x)html is invalid.

[Frederico Caldeira Knabben]

DUP of #71