Combine 2 exclusions in Layout Opportunity Tree if they shadow each other

third_party/WebKit/Source/core/layout/ng/geometry/ng_logical_rect.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/geometry/ng_logical_rect.h"
 
 #include "wtf/text/WTFString.h"
 
 namespace blink {
 
 bool NGLogicalRect::IsEmpty() const {
   return size.IsEmpty() && offset.inline_offset == LayoutUnit() &&
          offset.block_offset == LayoutUnit();
 }
 
 bool NGLogicalRect::IsContained(const NGLogicalRect& other) const {
   return !(InlineEndOffset() <= other.InlineStartOffset() ||
            BlockEndOffset() <= other.BlockStartOffset() ||
            InlineStartOffset() >= other.InlineEndOffset() ||
            BlockStartOffset() >= other.BlockEndOffset());
 }
 
 bool NGLogicalRect::operator==(const NGLogicalRect& other) const {
   return std::tie(other.offset, other.size) == std::tie(offset, size);
 }
 
 String NGLogicalRect::ToString() const {
-  return String::format("%s,%s %sx%s",
-                        offset.inline_offset.toString().ascii().data(),
-                        offset.block_offset.toString().ascii().data(),
-                        size.inline_size.toString().ascii().data(),
-                        size.block_size.toString().ascii().data());
+  return IsEmpty()
+             ? "(empty)"
+             : String::format("%sx%s at (%s,%s)",
+                              size.inline_size.toString().ascii().data(),
+                              size.block_size.toString().ascii().data(),
+                              offset.inline_offset.toString().ascii().data(),
+                              offset.block_offset.toString().ascii().data());
 }
 
 std::ostream& operator<<(std::ostream& os, const NGLogicalRect& value) {
   return os << value.ToString();
 }
 
 }  // namespace blink