[Zope-CMF] <u> not allowed in CMF Documents

[Tom Cameron]

I've just finished building a CMF based site for a client and they have
asked me why the <u> tag keeps disappearing from their documents.

I tested it out and sure enough it just keeps vanishing. Then after some
hunting found a method in /CMFDefault/utils.py that defines VALID_TAGS and
guess what - <u> is not one of them.

How can this be? has nobody every needed this tag? is there a simple
solution that does not involve modifying the source code?

Tom