Bug 225893 Autocomplete won't scroll with the mouse r=ben sr=mscott a=asa

xpfe/components/autocomplete/resources/content/autocomplete.xml

@@ -1487,6 +1487,8 @@
         this.textbox.mMenuOpen = false;
         this.selectedIndex = null;
       </handler>
+
+      <handler event="mousedown" phase="capturing" preventdefault="true"/>
     </handlers>
   </binding>
 
@@ -1542,7 +1544,7 @@
   </binding>
 
   <binding id="autocomplete-treerows">
-    <content onmousedown="event.preventDefault()">
+    <content>
       <xul:hbox flex="1" class="tree-bodybox">
         <children/>
       </xul:hbox>