Bug 369168, r+sr=roc

layout/generic/nsFrameSetFrame.cpp

@@ -1378,6 +1378,7 @@ nsHTMLFramesetFrame::RecalculateBorderResize()
   // number of any type of children
   PRUint32 numChildren = mContent->GetChildCount();
   for (childIndex = 0; childIndex < numChildren; childIndex++) {
+    childTypes[childIndex] = BLANK;
     nsIContent *child = mContent->GetChildAt(childIndex);
 
     if (child->IsNodeOfType(nsINode::eHTML)) {
@@ -1394,6 +1395,9 @@ nsHTMLFramesetFrame::RecalculateBorderResize()
       }
     }
   }
+  for (; childIndex < numCells; ++childIndex) {
+    childTypes[childIndex] = BLANK;
+  }
 
   // set the visibility and mouse sensitivity of borders
   PRInt32 verX;