Fix Border collapsing with colpsan / rowspan cells

third_party/WebKit/Source/core/layout/LayoutTableCol.h

 /*
  * Copyright (C) 1997 Martin Jones (mjones@kde.org)
  *           (C) 1997 Torben Weis (weis@kde.org)
  *           (C) 1998 Waldo Bastian (bastian@kde.org)
  *           (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 49 matching lines @@
 class LayoutTableCol final : public LayoutTableBoxComponent {
  public:
   explicit LayoutTableCol(Element*);
 
   void ClearPreferredLogicalWidthsDirtyBits();
 
   // The 'span' attribute in HTML.
   // For CSS table columns or colgroups, this is always 1.
   unsigned Span() const { return span_; }
 
-  bool IsTableColumnGroupWithColumnChildren() { return FirstChild(); }
+  bool IsTableColumnGroupWithColumnChildren() const { return FirstChild(); }
   bool IsTableColumn() const {
     return Style()->Display() == EDisplay::kTableColumn;
   }
   bool IsTableColumnGroup() const {
     return Style()->Display() == EDisplay::kTableColumnGroup;
   }
 
   LayoutTableCol* EnclosingColumnGroup() const;
+  LayoutTableCol* LastColumnInGroup() const;
 
   // Returns the next column or column-group.
   LayoutTableCol* NextColumn() const;
 
   const BorderValue& BorderAdjoiningCellStartBorder(
       const LayoutTableCell*) const;
   const BorderValue& BorderAdjoiningCellEndBorder(const LayoutTableCell*) const;
   const BorderValue& BorderAdjoiningCellBefore(const LayoutTableCell*) const;
   const BorderValue& BorderAdjoiningCellAfter(const LayoutTableCell*) const;
 
   const char* GetName() const override { return "LayoutTableCol"; }
 
+  // Return indexes to all columns inside this element.
+  // Can return vector with size 0 if LayoutTableCol is out of range.
+  // <col> element can return size() > 2 if it spans multiple columns
+  // <colgroup> element can return any size.
+  Vector<unsigned> GetEffectiveColumnIndexes() const;
+
  private:
   bool IsOfType(LayoutObjectType type) const override {
     return type == kLayoutObjectLayoutTableCol || LayoutBox::IsOfType(type);
   }
   void UpdateFromElement() override;
   void ComputePreferredLogicalWidths() override { NOTREACHED(); }
 
   void InsertedIntoTree() override;
   void WillBeRemovedFromTree() override;
 
   bool IsChildAllowed(LayoutObject*, const ComputedStyle&) const override;
   bool CanHaveChildren() const override;
   PaintLayerType LayerTypeRequired() const override { return kNoPaintLayer; }
 
   LayoutRect LocalVisualRect() const override;
 
   void StyleDidChange(StyleDifference, const ComputedStyle* old_style) override;
 
   LayoutTable* Table() const;
 
   unsigned span_;
 };
 
 DEFINE_LAYOUT_OBJECT_TYPE_CASTS(LayoutTableCol, IsLayoutTableCol());
 
 }  // namespace blink
 
 #endif