fix for #119404 (mail folders come up empty the first time that you open them).

fix by bienvenu.  r=naving,blizzard, sr=sspitzer, a=blizzard

mailnews/base/public/nsIMsgDBView.idl

@@ -43,6 +43,7 @@ interface nsIMsgWindow;
 interface nsIMessenger;
 interface nsIMsgDBHdr;
 interface nsIMsgDBViewCommandUpdater;
+interface nsIMsgDatabase;
 
 typedef long nsMsgViewNotificationCodeValue;
 typedef long nsMsgViewCommandCheckStateValue;
@@ -296,6 +297,8 @@ interface nsIMsgDBView : nsISupports
 
 	//to notify outliner that rows are going away
     void onDeleteCompleted(in boolean succeeded);
+
+    readonly attribute nsIMsgDatabase db;
 };
 
 /* this interface is rapidly morphing from a command updater interface into a more generic

mailnews/base/resources/content/msgMail3PaneWindow.js

@@ -108,6 +108,10 @@ var folderListener = {
                  // which will cause us to update commands.
                  if (gDBView) {
                    gDBView.suppressCommandUpdating = true;
+                   // if the db's view isn't set, something went wrong and we should reroot
+                   // the folder, which will re-open the view.
+                   if (!gDBView.db)
+                    gRerootOnFolderLoad = true;
                  }
                  if (gRerootOnFolderLoad)
                    RerootFolder(uri, msgFolder, gCurrentLoadingFolderViewType, gCurrentLoadingFolderViewFlags, gCurrentLoadingFolderSortType, gCurrentLoadingFolderSortOrder);

mailnews/base/src/nsMsgDBView.cpp

@@ -4908,6 +4908,13 @@ nsMsgDBView::OnDeleteCompleted(PRBool aSucceeded)
 
 }
 
+NS_IMETHODIMP nsMsgDBView::GetDb(nsIMsgDatabase **aDB)
+{
+  NS_ENSURE_ARG_POINTER(aDB);
+  NS_IF_ADDREF(*aDB = m_db);
+  return NS_OK;
+}
+
 PRBool nsMsgDBView::OfflineMsgSelected(nsMsgViewIndex * indices, PRInt32 numIndices)
 {
   nsCOMPtr <nsIMsgLocalMailFolder> localFolder = do_QueryInterface(m_folder);