Value of input format is set to the fields value

When the hidden field widgets are used with text fields, is the field value also used in the format field, and not the correct format value.

For example:

<input type="hidden" name="field_title_long_text_dummy[und][0][format]" value="Lorem ipsum dolor sit amet, consectetur adipiscing elit. Cras semper." />
<input type="hidden" name="field_title_long_text_dummy[und][0][value]" value="Lorem ipsum dolor sit amet, consectetur adipiscing elit. Cras semper" />

Instead it should be:

<input type="hidden" name="field_title_long_text_dummy[und][0][format]" value="full_html" />
<input type="hidden" name="field_title_long_text_dummy[und][0][value]" value="Lorem ipsum dolor sit amet, consectetur adipiscing elit. Cras semper" />

The attached patch tries to solve this issue.