change API to avoid using NS_COMFALSE. As jband puts it: NS_COMFALSE generally sucks. NS_COMFALSE is going away. fixes bug #11579

mailnews/base/util/nsMsgDBFolder.cpp

@@ -229,8 +229,15 @@ nsresult nsMsgDBFolder::ReadDBFolderInfo(PRBool force)
 
 				folderInfo->GetCharacterSet(&mCharset);
         
-				if (db && !db->HasNew() && mNumPendingUnreadMessages <= 0)
-					ClearFlag(MSG_FOLDER_FLAG_GOT_NEW);
+				if (db) {
+					PRBool hasnew;
+					nsresult rv;
+					rv = db->HasNew(&hasnew);
+					if (NS_FAILED(rv)) return rv;
+					if (!hasnew && mNumPendingUnreadMessages <= 0) {
+						ClearFlag(MSG_FOLDER_FLAG_GOT_NEW);
+					}
+				}
             }
 
         }

mailnews/db/msgdb/public/nsIMsgDatabase.idl

@@ -149,7 +149,7 @@ interface  nsIMsgDatabase : nsIDBChangeAnnouncer {
                              in nsIDBChangeListener instigator);
 
   readonly attribute nsMsgKey FirstNew;
-  void HasNew();  // returns NS_OK if true, NS_COMFALSE if false
+  boolean HasNew();  
   void ClearNewList(in boolean notify);
   void AddToNewList(in nsMsgKey key);
 

mailnews/db/msgdb/public/nsMsgDatabase.h

@@ -167,7 +167,7 @@ public:
                              nsIDBChangeListener *instigator);
 
   NS_IMETHOD GetFirstNew(nsMsgKey *result);
-  NS_IMETHOD HasNew(void);  // returns NS_OK if true, NS_COMFALSE if false
+  NS_IMETHOD HasNew(PRBool *_retval);  
   NS_IMETHOD ClearNewList(PRBool notify);
   NS_IMETHOD AddToNewList(nsMsgKey key);
 

mailnews/db/msgdb/src/nsMsgDatabase.cpp

@@ -1524,20 +1524,34 @@ NS_IMETHODIMP nsMsgDatabase::ClearNewList(PRBool notify /* = FALSE */)
     return err;
 }
 
-NS_IMETHODIMP nsMsgDatabase::HasNew()
+NS_IMETHODIMP nsMsgDatabase::HasNew(PRBool *_retval)
 {
-	return (m_newSet && m_newSet->getLength() > 0) ? NS_OK : NS_COMFALSE;
+	if (!_retval) return NS_ERROR_NULL_POINTER;
+
+	if (m_newSet && m_newSet->getLength() > 0) {
+		*_retval = PR_TRUE;
+	}
+	else {
+		*_retval = PR_FALSE;
+	}
+
+	return NS_OK;
 }
 
 NS_IMETHODIMP nsMsgDatabase::GetFirstNew(nsMsgKey *result)
 {
 	// even though getLength is supposedly for debugging only, it's the only
 	// way I can tell if the set is empty (as opposed to having a member 0.
-	if (NS_SUCCEEDED(HasNew()))
+	PRBool hasnew;
+	nsresult rv;
+
+	rv = HasNew(&hasnew);
+	if (NS_FAILED(rv)) return rv;
+	if (hasnew)
 		*result = m_newSet->GetFirstMember();
 	else
 		*result = nsMsgKey_None;
-    return NS_OK;
+	return NS_OK;
 }