171711 r=cavin sr=bienvenu fixing regression delete in standalone mode works only once.

mailnews/base/resources/content/messageWindow.js

@@ -175,6 +175,7 @@ function HandleDeleteOrMoveMsgCompleted(folder)
 	var folderUri = folderResource.Value;
 	if((folderUri == gCurrentFolderUri) && gCurrentMessageIsDeleted)
 	{
+    gDBView.onDeleteCompleted(true);
     gCurrentMessageIsDeleted = false;
     if (gNextMessageViewIndexAfterDelete != nsMsgKey_None) 
     {
@@ -201,6 +202,7 @@ function HandleDeleteOrMoveMsgFailed(folder)
      return;
 
   var folderUri = folderResource.Value;
+  gDBView.onDeleteCompleted(false);
   if((folderUri == gCurrentFolderUri) && gCurrentMessageIsDeleted)
   {
     gCurrentMessageIsDeleted = false;
@@ -210,7 +212,7 @@ function HandleDeleteOrMoveMsgFailed(folder)
 function OnLoadMessageWindow()
 {
 	HideMenus();
-  	AddMailOfflineObserver();
+  AddMailOfflineObserver();
 	CreateMailWindowGlobals();
 	CreateMessageWindowGlobals();
 	verifyAccounts(null);

mailnews/base/src/nsMsgDBView.cpp

@@ -5030,7 +5030,7 @@ nsMsgDBView::OnDeleteCompleted(PRBool aSucceeded)
 {
   if (m_deletingRows)
   { 
-    if (aSucceeded)
+    if (aSucceeded && mTreeSelection)
     {
 
       PRInt32 selectionCount;