Remove unnecessary anonymous blocks when splitting anonymous boxes

third_party/WebKit/Source/core/layout/LayoutBlock.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2007 David Smith (catfish.man@gmail.com)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) Research In Motion Limited 2010. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
@@ skipping 637 matching lines @@
     setChildrenInline(true);
 }
 
 void LayoutBlock::collapseAnonymousBlockChild(LayoutBlock* parent, LayoutBlock* child)
 {
     // It's possible that this block's destruction may have been triggered by the
     // child's removal. Just bail if the anonymous child block is already being
     // destroyed. See crbug.com/282088
     if (child->beingDestroyed())
         return;
+    if (child->continuation())
+        return;
+    // Ruby elements use anonymous wrappers for ruby runs and ruby bases by design, so we don't remove them.
+    if (child->isRubyRun() || child->isRubyBase())
+        return;
     parent->setNeedsLayoutAndPrefWidthsRecalcAndFullPaintInvalidation(LayoutInvalidationReason::ChildAnonymousBlockChanged);
 
     child->moveAllChildrenTo(parent, child->nextSibling(), child->hasLayer());
     parent->setChildrenInline(child->childrenInline());
 
     parent->children()->removeChildNode(parent, child, child->hasLayer());
     child->destroy();
 }
 
 void LayoutBlock::removeChild(LayoutObject* oldChild)
@@ skipping 2190 matching lines @@
 void LayoutBlock::showLineTreeAndMark(const InlineBox* markedBox1, const char* markedLabel1, const InlineBox* markedBox2, const char* markedLabel2, const LayoutObject* obj) const
 {
     showLayoutObject();
     for (const RootInlineBox* root = firstRootBox(); root; root = root->nextRootBox())
         root->showLineTreeAndMark(markedBox1, markedLabel1, markedBox2, markedLabel2, obj, 1);
 }
 
 #endif
 
 } // namespace blink