Values not being saved when using select2 widget inside of DataGridField.

[andreesg]

When using RelatedItemsWidget or AjaxSelectWidget inside of a DataGridField the values added to a new row are not saved. Values from other subfields (TextLine for example) are saved.

The issue can be reproduced using the following dependencies:

plone.app.widgets = 1.x
collective.z3cform.datagridfield = 1.1

Steps to reproduce:

Install collective.z3cform.datagridfield and create a content type using this as a datagrid field:

category = ListField(title=_(u’Category')
        value_type=DictRow(title=_(u'Category'), schema=ICategory),
        required=False)
form.widget(category=DataGridFieldFactory)

Create the interface schema:

class ICategory(form.Schema):
    form.widget('name', AjaxSelectFieldWidget, vocabulary=“your.product.vocabulary")
    name = schema.List(
        title=_(u'Category'),
        required=False,
        value_type=schema.TextLine(),
        missing_value=[]
    )
    notes = schema.Text(title=_(Notes'), required=False)

I noticed that the values are getting empty to the GridDataConverter.
The extract function from DataGridFieldObject also returns the new rows with empty values for the subfields that are using the select2 widgets.

[jensens]

I added some changes to fix the date picker widget. Those might fix also problems with other patternslib based widgets.