It's very common to have a content type that has both an add- and an
edit form. If you have custom widget setup code and other logic, you
often have to replicate this across both forms to make them consistent.
Is there a standard/recommended z3c.form pattern to reduce duplication
in this case?
Author of `Professional Plone Development`, a book for developers who
want to work with Plone. See http://martinaspeli.net/plone-book
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