Bug 363378: Caret gets stuck (or moves incorrectly) in empty table cells when using left/right arrow keys. r+sr=roc

layout/generic/nsContainerFrame.cpp

@@ -239,6 +239,22 @@ nsContainerFrame::IsLeaf() const
   return PR_FALSE;
 }
 
+PRBool
+nsContainerFrame::PeekOffsetNoAmount(PRBool aForward, PRInt32* aOffset)
+{
+  NS_ASSERTION (aOffset && *aOffset <= 1, "aOffset out of range");
+  // Don't allow the caret to stay in an empty (leaf) container frame.
+  return PR_FALSE;
+}
+
+PRBool
+nsContainerFrame::PeekOffsetCharacter(PRBool aForward, PRInt32* aOffset)
+{
+  NS_ASSERTION (aOffset && *aOffset <= 1, "aOffset out of range");
+  // Don't allow the caret to stay in an empty (leaf) container frame.
+  return PR_FALSE;
+}
+
 /////////////////////////////////////////////////////////////////////////////
 // Helper member functions
 

layout/generic/nsContainerFrame.h

@@ -69,6 +69,8 @@ public:
   virtual void ChildIsDirty(nsIFrame* aChild);
 
   virtual PRBool IsLeaf() const;
+  virtual PRBool PeekOffsetNoAmount(PRBool aForward, PRInt32* aOffset);
+  virtual PRBool PeekOffsetCharacter(PRBool aForward, PRInt32* aOffset);
   
 #ifdef DEBUG
   NS_IMETHOD List(FILE* out, PRInt32 aIndent) const;