Invalidate line break selection rects when selected.

Source/core/layout/LayoutBR.cpp

 /**
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2006 Apple Computer, Inc.
  *
  * 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,
@@ skipping 26 matching lines @@
 
 LayoutBR::LayoutBR(Node* node)
     : LayoutText(node, newlineString())
 {
 }
 
 LayoutBR::~LayoutBR()
 {
 }
 
+LayoutRect LayoutBR::selectionRectForPaintInvalidation(const LayoutBoxModelObject* paintInvalidationContainer) const
+{
+    if (!RuntimeEnabledFeatures::selectionPaintingWithoutSelectionGapsEnabled())
+        return LayoutRect();
+
+    // Although line breaks contain no actual text, if we're selected we need
+    // to return a rect that includes space to illustrate a newline.
+    return LayoutText::selectionRectForPaintInvalidation(paintInvalidationContainer);
+}
+
 int LayoutBR::lineHeight(bool firstLine) const
 {
     const ComputedStyle& style = styleRef(firstLine && document().styleEngine().usesFirstLineRules());
     return style.computedLineHeight();
 }
 
 void LayoutBR::styleDidChange(StyleDifference diff, const ComputedStyle* oldStyle)
 {
     LayoutText::styleDidChange(diff, oldStyle);
 }
 
 int LayoutBR::caretMinOffset() const
 {
     return 0;
 }
 
 int LayoutBR::caretMaxOffset() const
 {
     return 1;
 }
 
 PositionWithAffinity LayoutBR::positionForPoint(const LayoutPoint&)
 {
     return createPositionWithAffinity(0);
 }
 
 } // namespace blink