Path Handler can result in selection of map in IE (Closes #1410), with patch + research from bjorn (hooray!)

git-svn-id: http://svn.openlayers.org/trunk/openlayers@6708 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Renderer/VML.js

@@ -321,6 +321,12 @@ OpenLayers.Renderer.VML = OpenLayers.Class(OpenLayers.Renderer.Elements, {
         if (id) {
             node.setAttribute('id', id);
         }
+        
+        // IE hack to make elements unselectable, to prevent 'blue flash'
+        // while dragging vectors; #1410
+        node.setAttribute('unselectable', 'on', 0);
+        node.onselectstart = function() { return(false); };
+        
         return node;    
     },