Bug 1417010 - Invalidate MathML display items whenever we invalidate the referenced nsMathMLChar. r=miko

layout/mathml/nsMathMLmencloseFrame.cpp

@@ -151,6 +151,7 @@ nsresult nsMathMLmencloseFrame::AddNotation(const nsAString& aNotation)
  */
 void nsMathMLmencloseFrame::InitNotations()
 {
+  MarkNeedsDisplayItemRebuild();
   mNotationsToDraw.clear();
   mLongDivCharIndex = mRadicalCharIndex = -1;
   mMathMLChar.Clear();

layout/mathml/nsMathMLmfencedFrame.cpp

@@ -64,6 +64,7 @@ nsMathMLmfencedFrame::AttributeChanged(int32_t         aNameSpaceID,
                                        nsAtom*        aAttribute,
                                        int32_t         aModType)
 {
+  MarkNeedsDisplayItemRebuild();
   RemoveFencesAndSeparators();
   CreateFencesAndSeparators(PresContext());