prevent attribute.change event from firing when new attr value is the same as the old one

Author: Graham Butler

NOTES.md

@@ -1 +1,3 @@
 - Add cloak
+- Add 'connected' & 'rendered' properties
+- Add 'once' listener

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@author.io/element-base",
-  "version": "1.1.3",
+  "version": "1.1.4",
   "description": "Base class for all author-* custom elements (web components).",
   "main": "dist/author-base.min.js",
   "scripts": {

src/element.js

@@ -979,6 +979,10 @@ const AuthorBaseElement = superClass => class extends superClass {
    * Fires after change has been applied to matching properties.
    */
   attributeChangedCallback (attribute, oldValue, newValue) {
+    if (newValue === oldValue) {
+      return
+    }
+
     this.emit('attribute.change', {
       attribute,
       oldValue,
@@ -1046,6 +1050,7 @@ const AuthorBaseElement = superClass => class extends superClass {
     }
 
     this.dispatchEvent(event)
+    return event
   }
 
   /**