Reviewed by Darin.

    Reviewed by Darin.

	<rdar://problem/3805137> REGRESSION: Cannot search on pricetool.com

        The problem here is that residual style handling can cause an
	element associated with a misnested form to lose the association,
	because it can become detached and then reattached in this
	case. So we need to maintain the association.

        * khtml/html/html_formimpl.h: Added list of dormant elements to form,
	and dormant bit to generic form element.
	* khtml/html/html_formimpl.cpp:
        (DOM::HTMLFormElementImpl::~HTMLFormElementImpl): Clear m_form field for
	dormant elements too.
        (DOM::HTMLFormElementImpl::registerFormElement): Remove from dormant list
	in addition to adding to main list.
        (DOM::HTMLFormElementImpl::removeFormElement): Remove from both lists.
        (DOM::HTMLFormElementImpl::makeFormElementDormant): New method, remove from
	main list, add to dormant list.
        (DOM::HTMLGenericFormElementImpl::HTMLGenericFormElementImpl): Initialize
	dormant bit to false.
        (DOM::HTMLGenericFormElementImpl::insertedIntoDocument): If the element is
	dormant and has a form, re-register it and clear the dormant bit.
        (DOM::HTMLGenericFormElementImpl::removedFromDocument): If the document has
	a form, tell the form it is dormant and set the dormant bit.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@7633 268f45cc-cd09-0410-ab3c-d52691b4dbfc