49339 "Saving File" dialog doesn't initially show complete filename

Replaced call to ScrollSelectionIntoView() in SetTextControlFrameState()
with a call to nsIScrollableView::ScrollTo() that resets the scroll position
of the text widget to (0,0) when the value is replaced.
r=sfraser@netscape.com

layout/html/forms/src/nsGfxTextControlFrame2.cpp

@@ -1075,6 +1075,7 @@ nsGfxTextControlFrame2::nsGfxTextControlFrame2(nsIPresShell* aShell):nsStackFram
   mCachedState = nsnull;
   mSuggestedWidth = NS_FORMSIZE_NOTSET;
   mSuggestedHeight = NS_FORMSIZE_NOTSET;
+  mScrollableView = nsnull;
 }
 
 nsGfxTextControlFrame2::~nsGfxTextControlFrame2()
@@ -3035,7 +3036,14 @@ nsGfxTextControlFrame2::SetTextControlFrameState(const nsAReadableString& aValue
       if (domSel)
         domSel->EndBatchChanges();
     }
-    mTextSelImpl->ScrollSelectionIntoView(nsISelectionController::SELECTION_NORMAL,nsISelectionController::SELECTION_FOCUS_REGION);
+
+    if (mScrollableView)
+    {
+      // Scroll the upper left corner of the text control's
+      // content area back into view.
+
+      mScrollableView->ScrollTo(0, 0, NS_VMREFRESH_NO_SYNC);
+    }
   }
   else
   {
@@ -3109,6 +3117,7 @@ nsGfxTextControlFrame2::SetInitialChildList(nsIPresContext* aPresContext,
       view->QueryInterface(NS_GET_IID(nsIScrollableView),(void **)&scrollView);
       if (scrollView)
       {
+        mScrollableView = scrollView; // Note: views are not addref'd
         mTextSelImpl->SetScrollableView(scrollView);
         break;
       }

layout/html/forms/src/nsGfxTextControlFrame2.h

@@ -46,6 +46,7 @@ class nsISelectionController;
 class nsTextInputSelectionImpl;
 class nsTextInputListener;
 class nsIDOMCharacterData;
+class nsIScrollableView;
 
 
 class nsGfxTextControlFrame2 : public nsStackFrame,
@@ -251,6 +252,7 @@ private:
   nsFormFrame *mFormFrame;
   nsTextInputSelectionImpl *mTextSelImpl;
   nsTextInputListener *mTextListener;
+  nsIScrollableView *mScrollableView;
 };
 
 #endif