Invalidate line break selection rects when selected.

Source/core/layout/LayoutBR.h

 /*
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  *
  * 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
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 18 matching lines @@
  */
 namespace blink {
 
 class LayoutBR final : public LayoutText {
 public:
     explicit LayoutBR(Node*);
     ~LayoutBR() override;
 
     const char* name() const override { return "LayoutBR"; }
 
-    LayoutRect selectionRectForPaintInvalidation(const LayoutBoxModelObject* /* paintInvalidationContainer */) const override
-    {
-        // TODO(wkorman): When selected we need to return a rect that includes the
-        // space highlighted to illustrate a newline.
-        return LayoutRect();
-    }
+    LayoutRect selectionRectForPaintInvalidation(const LayoutBoxModelObject* /* paintInvalidationContainer */) const override;
 
     float width(unsigned /* from */, unsigned /* len */, const Font&, LayoutUnit /* xpos */, TextDirection, HashSet<const SimpleFontData*>* = nullptr /* fallbackFonts */ , FloatRect* /* glyphBounds */ = nullptr) const override { return 0; }
     float width(unsigned /* from */, unsigned /* len */, LayoutUnit /* xpos */, TextDirection, bool = false /* firstLine */, HashSet<const SimpleFontData*>* = nullptr /* fallbackFonts */, FloatRect* /* glyphBounds */ = nullptr) const override { return 0; }
 
     int lineHeight(bool firstLine) const;
 
     bool isOfType(LayoutObjectType type) const override { return type == LayoutObjectBr || LayoutText::isOfType(type); }
 
     int caretMinOffset() const override;
     int caretMaxOffset() const override;
 
     PositionWithAffinity positionForPoint(const LayoutPoint&) final;
 
 protected:
     void styleDidChange(StyleDifference, const ComputedStyle* oldStyle) override;
 };
 
 DEFINE_LAYOUT_OBJECT_TYPE_CASTS(LayoutBR, isBR());
 
 } // namespace blink
 
 #endif // LayoutBR_h