Same form twice in one template: hidden fields for empty values are only rendered once
Noticed this in fluid extension and think this is also relevant for the Fluid package.
If you use nearly the same form twice in one template, the hidden fields for empty values are only rendered for the upper form.
In Tx_Fluid_ViewHelpers_Form_AbstractFormFieldViewHelper::renderHiddenFieldForEmptyValue the Tx_Fluid_ViewHelpers_FormViewHelper is checked and this also contains the $hiddenFieldNames of the upper form.
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