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Currently, button_to's generated form element is hard coded to having the class "button_to".
This is somewhat inconvenient when trying to hook forms for ajax trickery, as the only class you control is the class of the submit element.
If, for instance, you've got several actions rendered as button_to, the only way to properly hook the submits would be to use 'form:has(.some-action-class)' selectors, which is quite convoluted.
This patch adds the :form_class modifier to button_to's html_options.