Edited Issue: HTMLEditorExtender UNDO after REMOVE FORMATTING wipes out most of text. [27167]

On IE9 if you select some formatted text and click on "Remove Formatting" this works OK. But if you immediately click on "Undo" then only a portion of all the text in the editor survives. I think it is only the current "line" of text.

This seems to work fine in IE9 Compatibilty Mode, IE8, IE7, Firefox, Safari and Chrome.