Fix for bug #46396: select after input confuses session history

Moved code that set initial value of text control via the editor from
CreateAnonymousContent() to a new method called SetInitialValue().
SetInitialValue() is now called during the frame's first reflow.
Added mUseEditor to indicate when it is safe to use the editor
to get and set values.
r=mjudge@netscape.com


git-svn-id: svn://10.0.0.236/trunk@78409 18797224-902f-48f8-a5cc-f745e15eee43

mozilla/layout/html/forms/src/nsGfxTextControlFrame2.h

@@ -152,6 +152,7 @@ public: //for methods who access nsGfxTextControlFrame2 directly
   NS_IMETHOD InternalContentChanged();//notify that we have some kind of change.
   NS_IMETHOD CallOnChange();
 protected:
+  nsresult SetInitialValue();
   nsString *GetCachedString();
   virtual PRIntn GetSkipSides() const;
   void RemoveNewlines(nsString &aString);
@@ -243,6 +244,7 @@ private:
   nscoord      mSuggestedHeight;
   nsSize       mSize;
 
+  PRPackedBool mUseEditor;
   PRPackedBool mIsProcessing;
   PRPackedBool mNotifyOnInput;//default this to off to stop any notifications until setup is complete