fix for #47830. thanks to gemal@gemal.dk for starting the fix.

rest of fix to #16336, hide "Get Next [x] News Message" menu item when not reading news.
change [x] based on the server prefs.

r=mscott

mailnews/base/resources/content/mailWindowOverlay.js

@@ -666,9 +666,19 @@ function IsGetNextNMessagesEnabled()
     var server = folder.server;
     var serverType = server.type;
    
-    if((serverType == "nntp"))
+	var menuItem = document.getElementById("menu_getnextnmsg");
+    if((serverType == "nntp")) {
+		var newsServer = server.QueryInterface(Components.interfaces.nsINntpIncomingServer);
+		var menuValue = Bundle.formatStringFromName("getNextNMessages",
+                                        [ newsServer.maxArticles], 1);
+		menuItem.setAttribute("value",menuValue);
+		menuItem.setAttribute("hidden","false");
         return true;
-    else return false;
+	}
+    else {
+		menuItem.setAttribute("hidden","true");
+		return false;
+	}
 }
 
 function IsEmptyTrashEnabled()

mailnews/base/resources/content/mailWindowOverlay.xul

@@ -573,7 +573,7 @@ Rights Reserved.
 			 accesskey="&getNewMsgCmd.accesskey;"
 			 key="key_getNewMessages"
 			 observes="cmd_getNewMessages"/>
-			<menuitem value="&getNextNMsgCmd.label;"
+			<menuitem id="menu_getnextnmsg" value="&getNextNMsgCmd.label;"
 			 observes="cmd_getNextNMessages"/>
 			<menuitem value="&sendUnsentCmd.label;"
 			 accesskey="&sendUnsentCmd.accesskey;"