Bug 341047: After "Close other tabs" tab's context menu contains scrollbars/arrows. Patch by Serge Gautherie <sgautherie.bz@free.fr>, r+sr=jag

xpfe/global/resources/content/bindings/scrollbox.xml

@@ -41,13 +41,18 @@
 
           this.mScrollBoxObject.scrollByIndex(lines);
         ]]></body>
-      </method>            
+      </method>
     </implementation>    
 
     <handlers>
       <handler event="DOMMouseScroll" action="this.scrollByIndex(event.detail); event.stopPropagation();"/>
 
       <handler event="underflow"><![CDATA[
+        // XXX Workaround for unexpected events dispatched during scrollbox
+        // destruction (bug 341047).
+        if (this.boxObject.width <= 0)
+          return;
+
         var kids = document.getAnonymousNodes(this);
         kids[0].collapsed = true;
         kids[2].collapsed = true;
@@ -55,6 +60,11 @@
       ]]></handler>
 
       <handler event="overflow"><![CDATA[
+        // XXX Workaround for unexpected events dispatched during scrollbox
+        // destruction (bug 341047).
+        if (this.boxObject.width <= 0)
+          return;
+
         var kids = document.getAnonymousNodes(this);
         kids[0].collapsed = false;
         kids[2].collapsed = false;