Another little annoyance/bug I've found while moving old code through the editor is the creation of an extra tag.
Example:
if i move code into the editor that starts with the tag <strong> or <b> maybe others too. then after pasting the code in the editor i click the select all button and then change the font a span is created as it should be at the top of the page with the name of the font like this <span...><b>what was bold</b>... now the annoying thing is that the editor will create antoher <b> tag at the very beginnig of the code so the actual resulting code from the change of font is <b><span...><b>what was bold</b>...