https://bugs.webkit.org/show_bug.cgi?id=45164

Reviewed by Dan Bernstein.

REGRESSION: <a><img align=top></a> Clickable area too large
        
Make sure to clamp hit testing of quirky inline flow boxes the same way we already clamped
painting.

Source/WebCore: 

* rendering/InlineFlowBox.cpp:
(WebCore::InlineFlowBox::nodeAtPoint):

LayoutTests: 

* fast/inline/inline-position-top-align-expected.txt: Added.
* fast/inline/inline-position-top-align.html: Added.



git-svn-id: svn://svn.chromium.org/blink/trunk@81055 bbb929c8-8fbe-4397-9dbb-9b2b20218538
void InlineFlowBox::adjustMaxAscentAndDescent(int& maxAscent, int& maxDescent, int maxPositionTop, int maxPositionBottom)
{
    for (InlineBox* curr = firstChild(); curr; curr = curr->nextOnLine()) {
        if (curr->renderer()->isPositioned())
            continue; // Positioned placeholders don't affect calculations.
        if (curr->verticalAlign() == TOP || curr->verticalAlign() == BOTTOM) {
            int lineHeight = curr->lineHeight();
            if (curr->verticalAlign() == TOP) {
                if (maxAscent + maxDescent < lineHeight)
                    maxDescent = lineHeight - maxAscent;
            }
            else {
                if (maxAscent + maxDescent < lineHeight)
                    maxAscent = lineHeight - maxDescent;
            }

            if (maxAscent + maxDescent >= max(maxPositionTop, maxPositionBottom))
                break;
        }

        if (curr->isInlineFlowBox())
            static_cast<InlineFlowBox*>(curr)->adjustMaxAscentAndDescent(maxAscent, maxDescent, maxPositionTop, maxPositionBottom);
    }
}

void InlineFlowBox::adjustMaxAscentAndDescent(int& maxAscent, int& maxDescent, int maxPositionTop, int maxPositionBottom)
{
    for (InlineBox* curr = firstChild(); curr; curr = curr->nextOnLine()) {
        if (curr->renderer()->isPositioned())
            continue; // Positioned placeholders don't affect calculations.
        if (curr->verticalAlign() == TOP || curr->verticalAlign() == BOTTOM) {
            int lineHeight = curr->lineHeight();
            if (curr->verticalAlign() == TOP) {
                if (maxAscent + maxDescent < lineHeight)
                    maxDescent = lineHeight - maxAscent;
            }
            else {
                if (maxAscent + maxDescent < lineHeight)
                    maxAscent = lineHeight - maxDescent;
            }

            if (maxAscent + maxDescent >= max(maxPositionTop, maxPositionBottom))
                break;
        }

        if (curr->isInlineFlowBox())
            static_cast<InlineFlowBox*>(curr)->adjustMaxAscentAndDescent(maxAscent, maxDescent, maxPositionTop, maxPositionBottom);
    }
}
