Fix premature termination of scroll animations while selecting text.

third_party/WebKit/Source/core/frame/FrameView.cpp

 /*
  * Copyright (C) 1998, 1999 Torben Weis <weis@kde.org>
  *                     1999 Lars Knoll <knoll@kde.org>
  *                     1999 Antti Koivisto <koivisto@kde.org>
  *                     2000 Dirk Mueller <mueller@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
  *           (C) 2006 Graham Dennis (graham.dennis@gmail.com)
  *           (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
@@ skipping 3725 matching lines @@
 
 Widget* FrameView::widget()
 {
     return this;
 }
 
 LayoutRect FrameView::scrollIntoView(const LayoutRect& rectInContent, const ScrollAlignment& alignX, const ScrollAlignment& alignY, ScrollType scrollType)
 {
     LayoutRect viewRect(visibleContentRect());
     LayoutRect exposeRect = ScrollAlignment::getRectToExpose(viewRect, rectInContent, alignX, alignY);
-
-    double xOffset = exposeRect.x();
-    double yOffset = exposeRect.y();
-
-    setScrollPosition(DoublePoint(xOffset, yOffset), scrollType);
+    if (exposeRect != viewRect)
+        setScrollPosition(DoublePoint(exposeRect.x(), exposeRect.y()), scrollType);
 
     // Scrolling the FrameView cannot change the input rect's location relative to the document.
     return rectInContent;
 }
 
 IntRect FrameView::scrollCornerRect() const
 {
     IntRect cornerRect;
 
     if (hasOverlayScrollbars())
@@ skipping 353 matching lines @@
     return m_hiddenForThrottling && m_crossOriginForThrottling;
 }
 
 LayoutBox& FrameView::boxForScrollControlPaintInvalidation() const
 {
     ASSERT(layoutView());
     return *layoutView();
 }
 
 } // namespace blink