REGRESSION(r176978): Inline-blocks with overflowing contents have ascents that are...

REGRESSION(r176978): Inline-blocks with overflowing contents have ascents that are too large
https://bugs.webkit.org/show_bug.cgi?id=141783

Reviewed by David Hyatt.

Source/WebCore:

When we have an inline-block element, and we want to find its baseline (to lay out other
elements on the same line) we loop through the element's children and ask them what their
baselines are. The children use the location of the top of their last line to compute this
value. However, if the child has overflow-y, this might not be the correct calculation.

This behavior is in the spec: "The baseline of an 'inline-block' is the baseline of its last
line box in the normal flow, unless it has either no in-flow line boxes or if its 'overflow'
property has a computed value other than 'visible', in which case the baseline is the bottom
margin edge."
    -- http://www.w3.org/TR/CSS21/visudet.html#leading

However, we believe that a better policy is, when overflow is not "visible," to place the
baseline at the bottom of the block if the contents overflowed in the Y direction, and to place
it at the bottom of the last line if the contents did not overflow in the Y direction. This is
partially consistent with previous behavior, and isn't too far from the spec to cause too many
breakages.

Test: fast/css/inline-block-tricky-baselines.html
      fast/text/baseline-inline-block.html

* rendering/RenderBlockFlow.cpp:
(WebCore::RenderBlockFlow::inlineBlockBaseline):

LayoutTests:

Update expected results.

* css3/flexbox/child-overflow-expected.html:
* css3/flexbox/child-overflow.html:
* fast/css/inline-block-tricky-baselines-expected.html: Added.
* fast/css/inline-block-tricky-baselines.html: Added.
* fast/forms/textfield-overflow-by-value-update-expected.txt:
* fast/text/baseline-inline-block-expected.html: Added.
* fast/text/baseline-inline-block.html: Added.
* platform/mac/fast/forms/search-vertical-alignment-expected.txt:

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@181292 268f45cc-cd09-0410-ab3c-d52691b4dbfc