Add dactylIUtils.createContents. Closes issue #581.

common/content/dactyl.js

@@ -143,6 +143,8 @@ var Dactyl = Module("dactyl", XPCOM(Ci.nsISupportsWeakReference, ModuleBase), {
         }
 
         function addChildren(node, parent) {
+            DOM(node).createContents();
+
             if (~["menu", "menupopup"].indexOf(node.localName) && node.children.length)
                 dispatch(node, "popupshowing");
 

common/modules/dom.jsm

@@ -688,6 +688,9 @@ var DOM = Class("DOM", {
         }, this);
     },
 
+    createContents: function createContents()
+        this.each(DOM.createContents, this),
+
     getSet: function getSet(args, get, set) {
         if (!args.length)
             return this[0] && get.call(this, this[0]);
@@ -1240,6 +1243,9 @@ var DOM = Class("DOM", {
                 })
     }),
 
+    createContents: Class.Memoize(function () services.has("dactyl") && services.dactyl.createContents
+        || function (elem) {}),
+
     /**
      * The set of input element type attribute values that mark the element as
      * an editable field.