fix for #75611. the Message | Mark menu item is supposed to have a seperator between it and the

"Ignore Thread" menu item when reading a news message.
fix by andreas.premstaller@uibk.ac.at, r/sr=sspitzer

mailnews/base/resources/content/mailWindowOverlay.js

@@ -231,6 +231,10 @@ function InitMessageMenu()
   }
 
   // we only kill and watch threads for news
+  var threadMenuSeparator = document.getElementById("threadItemsSeparator");
+  if (threadMenuSeparator) {
+      threadMenuSeparator.setAttribute("hidden", isNews ? "" : "true");
+  }
   var killThreadMenuItem = document.getElementById("killThread");
   if (killThreadMenuItem) {
       killThreadMenuItem.setAttribute("hidden", isNews ? "" : "true");

mailnews/base/resources/content/mailWindowOverlay.xul

@@ -1236,6 +1236,7 @@ Rights Reserved.
         <menuitem type="checkbox" id="markFlaggedMenuItem" label="&markFlaggedCmd.label;" accesskey="&markFlaggedCmd.accesskey;" observes="cmd_markAsFlagged"/>
       </menupopup>
     </menu>
+    <menuseparator id="threadItemsSeparator"/>
     <menuitem label="&killThreadMenu.label;"
         accesskey="&killThreadMenu.accesskey;"
         key="key_killThread"