Exclude background-repeat from comprasion when styling the controls.

Source/core/rendering/RenderTheme.cpp

 /**
  * This file is part of the theme implementation for form controls in WebCore.
  *
  * Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2012 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.
  *
@@ skipping 628 matching lines @@
 
 bool RenderTheme::isControlContainer(ControlPart appearance) const
 {
     // There are more leaves than this, but we'll patch this function as we add support for
     // more controls.
     return appearance != CheckboxPart && appearance != RadioPart;
 }
 
 static bool isBackgroundOrBorderStyled(const RenderStyle& style, const BorderData& border, const FillLayer& background, const Color& backgroundColor)
 {
+    // Code below excludes the background-repeat from comparison by resetting it
+    FillLayer backgroundCopy = background;
+    FillLayer backgroundLayersCopy = *style.backgroundLayers();
+    backgroundCopy.setRepeatX(NoRepeatFill);
+    backgroundCopy.setRepeatY(NoRepeatFill);
+    backgroundLayersCopy.setRepeatX(NoRepeatFill);
+    backgroundLayersCopy.setRepeatY(NoRepeatFill);
     // Test the style to see if the UA border and background match.
     return style.border() != border
-        || *style.backgroundLayers() != background
+        || backgroundLayersCopy != backgroundCopy
         || style.visitedDependentColor(CSSPropertyBackgroundColor) != backgroundColor;
 }
 
 bool RenderTheme::isControlStyled(const RenderStyle* style, const BorderData& border, const FillLayer& background, const Color& backgroundColor) const
 {
     switch (style->appearance()) {
     case PushButtonPart:
     case SquareButtonPart:
     case ButtonPart:
     case ProgressBarPart:
@@ skipping 718 matching lines @@
 
     // padding - not honored by WinIE, needs to be removed.
     style->resetPadding();
 
     // border - honored by WinIE, but looks terrible (just paints in the control box and turns off the Windows XP theme)
     // for now, we will not honor it.
     style->resetBorder();
 }
 
 } // namespace WebCore