keep folder cache from getting stale, r=putterman 18346

mailnews/base/public/nsIMsgFolder.idl

@@ -291,7 +291,7 @@ const nsMsgBiffState nsMsgBiffState_Unknown = 2; // We dunno whether there is ne
    * write out summary data for this folder
    * to the given folder cache (i.e. panacea.dat)
    */
-	void writeToFolderCache(in nsIMsgFolderCache folderCache);
+	void writeToFolderCache(in nsIMsgFolderCache folderCache, in boolean deep);
 
   /**
    * the charset of this folder
@@ -309,6 +309,8 @@ const nsMsgBiffState nsMsgBiffState_Unknown = 2; // We dunno whether there is ne
    */
 	readonly attribute wstring newMessagesNotificationDescription;
 
+	// are we running a url as a result of the user clicking get msg?
+	attribute boolean gettingNewMessages;
   /**
    * local path of this folder
    */

mailnews/base/public/nsIMsgFolderCache.idl

@@ -32,4 +32,5 @@ interface nsIMsgFolderCache : nsISupports
 	void Init(in nsIFileSpec fileSpec);
 	nsIMsgFolderCacheElement GetCacheElement(in string key, in boolean createIfMissing);
 	void Close();
+	void Commit(in boolean compress);
 };

mailnews/base/src/nsMsgFolderCache.cpp

@@ -416,11 +416,19 @@ NS_IMETHODIMP nsMsgFolderCache::GetCacheElement(const char *pathKey, PRBool crea
 
 NS_IMETHODIMP nsMsgFolderCache::Close()
 {
-	nsresult ret=NS_OK;
+  return Commit(PR_TRUE);
+}
 
-	nsIMdbThumb	*commitThumb = NULL;
+NS_IMETHODIMP nsMsgFolderCache::Commit(PRBool compress)
+{
+	nsresult ret = NS_OK;
+
+	nsIMdbThumb	*commitThumb = nsnull;
 	if (m_mdbStore)
-		ret = m_mdbStore->CompressCommit(GetEnv(), &commitThumb);
+    if (compress)
+		  ret = m_mdbStore->CompressCommit(GetEnv(), &commitThumb);
+    else
+      ret = m_mdbStore->LargeCommit(GetEnv(), &commitThumb);
 
 	if (commitThumb)
 	{

mailnews/base/util/nsMsgIncomingServer.cpp

@@ -163,7 +163,7 @@ NS_IMETHODIMP nsMsgIncomingServer::WriteToFolderCache(nsIMsgFolderCache *folderC
 	{
 		nsCOMPtr <nsIMsgFolder> msgFolder = do_QueryInterface(m_rootFolder, &rv);
 		if (NS_SUCCEEDED(rv) && msgFolder)
-			rv = msgFolder->WriteToFolderCache(folderCache);
+			rv = msgFolder->WriteToFolderCache(folderCache, PR_TRUE /* deep */);
 	}
 	return rv;
 }