Named mark definitions need to be stored on each renderer root. This change gives each defs node a unique id based on the renderer id. r=ahocevar (closes #1849)

git-svn-id: http://svn.openlayers.org/trunk/openlayers@8459 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Renderer/SVG.js

@@ -427,7 +427,7 @@ OpenLayers.Renderer.SVG = OpenLayers.Class(OpenLayers.Renderer.Elements, {
      * {DOMElement} The element to which we'll add the symbol definitions
      */
     createDefs: function() {
-        var defs = this.nodeFactory("ol-renderer-defs", "defs");
+        var defs = this.nodeFactory(this.container.id + "_defs", "defs");
         this.rendererRoot.appendChild(defs);
         return defs;
     },