Fix for bug #33938: Pref/reply below quoted text does not move to bottom

mozilla/mailnews/compose/nsMsgCompose.cpp

      - Scroll the selection into view after all the reply text
        is inserted and the caret is positioned.

    mozilla/editor/base/nsHTMLEditor.cpp

      - Added nsAutoEditBatch variable to InsertBreak() to make
        sure that we reflow before returning. Without this fix,
        apps like MsgCompose will not be able to scroll the
        selection properly.

r=jfrancis@netscape.com

editor/base/nsHTMLEditor.cpp

@@ -2762,6 +2762,7 @@ NS_IMETHODIMP nsHTMLEditor::InsertBreak()
   nsresult res;
   if (!mRules) { return NS_ERROR_NOT_INITIALIZED; }
 
+  nsAutoEditBatch beginBatching(this);
   nsAutoRules beginRulesSniffing(this, kOpInsertBreak, nsIEditor::eNext);
   nsCOMPtr<nsISelection> selection;
   PRBool cancel, handled;

editor/libeditor/html/nsHTMLEditor.cpp

@@ -2762,6 +2762,7 @@ NS_IMETHODIMP nsHTMLEditor::InsertBreak()
   nsresult res;
   if (!mRules) { return NS_ERROR_NOT_INITIALIZED; }
 
+  nsAutoEditBatch beginBatching(this);
   nsAutoRules beginRulesSniffing(this, kOpInsertBreak, nsIEditor::eNext);
   nsCOMPtr<nsISelection> selection;
   PRBool cancel, handled;

mailnews/compose/src/nsMsgCompose.cpp

@@ -29,6 +29,7 @@
 #include "nsIDOMHTMLInputElement.h"
 #include "nsIDOMDocument.h"
 #include "nsISelection.h"
+#include "nsISelectionController.h"
 #include "nsIDOMNamedNodeMap.h"
 #include "nsMsgI18N.h"
 #include "nsICharsetConverterManager.h"
@@ -361,6 +362,12 @@ nsresult nsMsgCompose::ConvertAndLoadComposeWindow(nsIEditorShell *aEditorShell,
       // This should set the cursor to the top!
       default	: editor->BeginningOfDocument();		break;
 	  }
+
+    nsCOMPtr<nsISelectionController> selCon;
+    editor->GetSelectionController(getter_AddRefs(selCon));
+
+    if (selCon)
+      selCon->ScrollSelectionIntoView(nsISelectionController::SELECTION_NORMAL, nsISelectionController::SELECTION_ANCHOR_REGION);
   }
 
   NotifyStateListeners(nsMsgCompose::eComposeFieldsReady);