This is related to issue, that comment can be a property of an object. So while
invoking: object.edit(comment='something') property is stored on object but
also is set in comment. Despite the fact that edit is workflow method, its usage
is mostly like normal method.

It is possible to store comment in edit workflow, by using doActionFor(object,
'edit_action', comment='comment to be stored in workflow history'). This can be
done in same transaction and thanks to this it will be related with edit
transition.


git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@34365 20353a03-c40f-0410-a6d1-a30d3c3de9de