LinesFieldWidget can not use TextAreaFieldWidget anymore as
Nicolas Delaby authored
it escapes values now.
Add test to avoid regressions

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@33913 20353a03-c40f-0410-a6d1-a30d3c3de9de
d5245b1b