implemented GetNewMessages() for a selected folder

mailnews/imap/src/nsImapMailFolder.cpp

@@ -511,7 +511,6 @@ NS_IMETHODIMP nsImapMailFolder::GetMessages(nsIEnumerator* *result)
 	return rv;
 }
 
-
 NS_IMETHODIMP nsImapMailFolder::CreateSubfolder(const char *folderName)
 {
 	nsresult rv = NS_OK;
@@ -851,6 +850,15 @@ NS_IMETHODIMP nsImapMailFolder::DeleteMessage(nsIMessage* message)
     return rv;
 }
 
+NS_IMETHODIMP nsImapMailFolder::GetNewMessages()
+{
+    nsresult rv = NS_ERROR_FAILURE;
+    NS_WITH_SERVICE(nsIImapService, imapService, kCImapService, &rv);
+    if (NS_FAILED(rv)) return rv;
+    rv = imapService->SelectFolder(m_eventQueue, this, this, nsnull);
+    return rv;
+}
+
 NS_IMETHODIMP nsImapMailFolder::PossibleImapMailbox(
 	nsIImapProtocol* aProtocol, mailbox_spec* aSpec)
 {

mailnews/imap/src/nsImapMailFolder.h

@@ -97,7 +97,9 @@ public:
     virtual nsresult GetDBFolderInfoAndDB(nsIDBFolderInfo **folderInfo,
                                           nsIMsgDatabase **db);
  	NS_IMETHOD DeleteMessage(nsIMessage *message);
-	NS_IMETHOD CreateMessageFromMsgDBHdr(nsIMsgDBHdr *msgHdr, nsIMessage **message);
+	NS_IMETHOD CreateMessageFromMsgDBHdr(nsIMsgDBHdr *msgHdr, nsIMessage
+                                         **message);
+    NS_IMETHOD GetNewMessages();
 
     // nsIImapMailFolderSink methods
     // Tell mail master about a discovered imap mailbox