Check if fragment's block size fits into a layout opportunity.

third_party/WebKit/Source/core/layout/ng/inline/ng_inline_layout_algorithm.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/layout/ng/inline/ng_inline_layout_algorithm.h"
 
 #include "core/layout/ng/inline/ng_bidi_paragraph.h"
 #include "core/layout/ng/inline/ng_inline_break_token.h"
 #include "core/layout/ng/inline/ng_inline_node.h"
 #include "core/layout/ng/inline/ng_line_box_fragment.h"
@@ skipping 31 matching lines @@
       .SetIsShrinkToFit(ShouldShrinkToFit(parent_style, style))
       .ToConstraintSpace(FromPlatformWritingMode(style.GetWritingMode()));
 }
 
 NGLogicalOffset GetOriginPointForFloats(const NGConstraintSpace& space,
                                         LayoutUnit content_size) {
   NGLogicalOffset origin_point = space.BfcOffset();
   origin_point.block_offset += content_size;
   return origin_point;
 }
+
+inline bool IsObjectReplacementCharacter(UChar character) {
+  return character == kObjectReplacementCharacter;
+}
+
 }  // namespace
 
 NGInlineLayoutAlgorithm::NGInlineLayoutAlgorithm(
     NGInlineNode* inline_node,
     NGConstraintSpace* space,
     NGInlineBreakToken* break_token)
     : NGLayoutAlgorithm(inline_node, space, break_token),
       is_horizontal_writing_mode_(
           blink::IsHorizontalWritingMode(space->WritingMode())),
       disallow_first_line_rules_(false),
@@ skipping 400 matching lines @@
   }
 
   box_states_.OnEndPlaceItems(&line_box);
 
   // The baselines are always placed at pixel boundaries. Not doing so results
   // in incorrect layout of text decorations, most notably underlines.
   LayoutUnit baseline = content_size_ + line_box.Metrics().ascent;
   baseline = LayoutUnit(baseline.Round());
 
   // Check if the line fits into the constraint space in block direction.
-  LayoutUnit line_bottom = baseline + line_box.Metrics().descent;
+  LayoutUnit line_bottom = baseline;
+
+  if (!Node()->Text().IsAllSpecialCharacters<IsObjectReplacementCharacter>())

[kojii, 2017/04/26 00:51:34]

This doesn't look correct, but I admit ascent/descent for replaced elements
needs more work.

Can you leave a comment that this maybe wrong but needed for
floats-wrap-top-below-002l-ref.xht, so that I can remember when I revisit?

+    line_bottom += line_box.Metrics().descent;
+
   if (!container_builder_.Children().IsEmpty() &&
       ConstraintSpace().AvailableSize().block_size != NGSizeIndefinite &&
       line_bottom > ConstraintSpace().AvailableSize().block_size) {
     return false;
   }
 
   // If there are more content to consume, create an unfinished break token.
   if (last_break_opportunity_index_ != items.size() - 1 ||
       last_break_opportunity_offset_ != Node()->Text().length()) {
     line_box.SetBreakToken(NGInlineBreakToken::Create(
@@ skipping 102 matching lines @@
 
   // max-content is the width without any line wrapping.
   // TODO(kojii): Implement hard breaks (<br> etc.) to break.
   for (const auto& item : Node()->Items())
     sizes.max_content += InlineSize(item);
 
   return sizes;
 }
 
 }  // namespace blink