Rename and move FormViewHelper's errorClass value, currently 'f3-form-error'
This should be renamed to
flow-form-error IMO, and the
$this->registerArgument('errorClass', 'string', 'CSS class to set if there are errors for this view helper', FALSE, 'f3-form-error');
is currently spread manually in every concrete ViewHelper's
initializeArgumentsmethod, better place would be \TYPO3\Fluid\ViewHelpers\Form\AbstractFormFieldViewHelper IMO
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