bug 464970 - nsCSSBorderRenderer::AreBorderSideFinalStylesSame is too pessimistic. r=vlad, a=beltzner

layout/base/nsCSSRenderingBorders.cpp

@@ -268,6 +268,10 @@ nsCSSBorderRenderer::AreBorderSideFinalStylesSame(PRUint8 aSides)
       continue;
     }
 
+    if (((1 << i) & aSides) == 0) {
+      continue;
+    }
+
     if (mBorderStyles[firstStyle] != mBorderStyles[i] ||
         mBorderColors[firstStyle] != mBorderColors[i] ||
         !nsBorderColors::Equal(mCompositeColors[firstStyle],