Bug 405271. MathML should not reflow children with a constrained height; that triggers pagination which is definitely not what we want. r+sr=bzbarsky

layout/mathml/base/src/nsMathMLTokenFrame.cpp

@@ -128,7 +128,7 @@ nsMathMLTokenFrame::Reflow(nsPresContext*          aPresContext,
   aDesiredSize.ascent = 0;
   aDesiredSize.mBoundingMetrics.Clear();
 
-  nsSize availSize(aReflowState.ComputedWidth(), aReflowState.ComputedHeight());
+  nsSize availSize(aReflowState.ComputedWidth(), NS_UNCONSTRAINEDSIZE);
   nsIFrame* childFrame = GetFirstChild(nsnull);
   while (childFrame) {
     // ask our children to compute their bounding metrics

layout/mathml/base/src/nsMathMLmactionFrame.cpp

@@ -283,8 +283,7 @@ nsMathMLmactionFrame::Reflow(nsPresContext*          aPresContext,
   mBoundingMetrics.Clear();
   nsIFrame* childFrame = GetSelectedFrame();
   if (childFrame) {
-    nsSize availSize(aReflowState.ComputedWidth(),
-                     aReflowState.ComputedHeight());
+    nsSize availSize(aReflowState.ComputedWidth(), NS_UNCONSTRAINESIZE);
     nsHTMLReflowState childReflowState(aPresContext, aReflowState,
                                        childFrame, availSize);
     rv = ReflowChild(childFrame, aPresContext, aDesiredSize,

layout/mathml/base/src/nsMathMLmfencedFrame.cpp

@@ -289,7 +289,7 @@ nsMathMLmfencedFrame::doReflow(nsPresContext*          aPresContext,
   // refactored to use nsMathMLContainerFrame::Reflow() at some stage.
 
   nsReflowStatus childStatus;
-  nsSize availSize(aReflowState.ComputedWidth(), aReflowState.ComputedHeight());
+  nsSize availSize(aReflowState.ComputedWidth(), NS_UNCONSTRAINEDSIZE);
   nsIFrame* firstChild = aForFrame->GetFirstChild(nsnull);
   nsIFrame* childFrame = firstChild;
   nscoord ascent = 0, descent = 0;

layout/mathml/base/src/nsMathMLmrootFrame.cpp

@@ -159,7 +159,7 @@ nsMathMLmrootFrame::Reflow(nsPresContext*          aPresContext,
                            nsReflowStatus&          aStatus)
 {
   nsresult rv = NS_OK;
-  nsSize availSize(aReflowState.ComputedWidth(), aReflowState.ComputedHeight());
+  nsSize availSize(aReflowState.ComputedWidth(), NS_UNCONSTRAINEDSIZE);
   nsReflowStatus childStatus;
 
   aDesiredSize.width = aDesiredSize.height = 0;