In my views, I override the text for the filter button for exposed filters. The text is rendered correctly, but while debugging another issue, I noticed there's an element in the $input array (first arg for that member function) with a blank index. For example, the last five items in that array for one of my views are:
'submit' => "Filter"'reset' => "Reset"'form_build_id' => "form-GeIWX9X-mNXDa_BxzyPZcHacqwiZjszmrvfn1VLCMbw"'form_id' => "views_exposed_form"'' => "Filter"I have verified that it is related to overriding the button text because I changed it and the new value showed in the array (as well as on the page). I suspect that it is rendering correctly because of the 'submit" element of the array.