I made some changes a while back to how form submission worked, and I busted FrameMac::submitForm. Strangely enough, no one has seemed to notice. However, WebKit is no longer seeing any form submission data, like it used to. This call: if (!request.doPost()) { [_bridge loadURL:request.url().getNSURL() referrer:[_bridge referrer] reload:request.reload userGesture:true target:request.frameName triggeringEvent:_currentEvent form:_formAboutToBeSubmitted formValues:_formValuesAboutToBeSubmitted]; _formAboutToBeSubmitted and _formValuesAboutToBeSubmitted are always nil. Those values are now held down on Frame, and just need to be converted from WebCore types into NS types and sent up to WebKit. It's simple to fix. I'm filing this bug so I don't forget. Maybe somone who knows more about that code path can comment as to why no one has noticed this being broken. Maybe WebKit no longer needs to know about form submission data (unless it's for autofill?)
Yes, it's primarily for auto-fill.
I have a patch to fix this.