Check the visibilty before painting the fraction line and the radical bar, b=275823, r+sr=roc

layout/mathml/base/src/nsMathMLmfracFrame.cpp

@@ -233,6 +233,7 @@ nsMathMLmfracFrame::Paint(nsPresContext*      aPresContext,
                       aDirtyRect, aWhichLayer, this);
   }
   else if ((NS_FRAME_PAINT_LAYER_FOREGROUND == aWhichLayer) &&
+           mStyleContext->GetStyleVisibility()->IsVisible() &&
            !NS_MATHML_HAS_ERROR(mPresentationData.flags) &&
            !mLineRect.IsEmpty()) {
     // paint the fraction line with the current text color

layout/mathml/base/src/nsMathMLmrootFrame.cpp

@@ -146,7 +146,9 @@ nsMathMLmrootFrame::Paint(nsPresContext*      aPresContext,
     mSqrChar.Paint(aPresContext, aRenderingContext,
                    aDirtyRect, aWhichLayer, this);
 
-    if (NS_FRAME_PAINT_LAYER_FOREGROUND == aWhichLayer && !mBarRect.IsEmpty()) {
+    if (NS_FRAME_PAINT_LAYER_FOREGROUND == aWhichLayer &&
+        mStyleContext->GetStyleVisibility()->IsVisible() &&
+        !mBarRect.IsEmpty()) {
       // paint the overline bar
       const nsStyleColor* color = GetStyleColor();
       aRenderingContext.SetColor(color->mColor);

layout/mathml/base/src/nsMathMLmsqrtFrame.cpp

@@ -156,7 +156,9 @@ nsMathMLmsqrtFrame::Paint(nsPresContext*      aPresContext,
     mSqrChar.Paint(aPresContext, aRenderingContext,
                    aDirtyRect, aWhichLayer, this);
 
-    if (NS_FRAME_PAINT_LAYER_FOREGROUND == aWhichLayer && !mBarRect.IsEmpty()) {
+    if (NS_FRAME_PAINT_LAYER_FOREGROUND == aWhichLayer &&
+        mStyleContext->GetStyleVisibility()->IsVisible() &&
+        !mBarRect.IsEmpty()) {
       // paint the overline bar
       const nsStyleColor* color = GetStyleColor();
       aRenderingContext.SetColor(color->mColor);