Merge pull request #922 from matrix-org/bwindels/editedmarker

Add method to retrieve replacing event

src/models/event.js

@@ -825,6 +825,15 @@ utils.extend(module.exports.MatrixEvent.prototype, {
         return this._replacingEvent && this._replacingEvent.getId();
     },
 
+    /**
+     * Returns the event replacing the content of this event, if any.
+     *
+     * @return {MatrixEvent?}
+     */
+    replacingEvent() {
+        return this._replacingEvent;
+    },
+
     /**
      * Summarise the event as JSON for debugging. If encrypted, include both the
      * decrypted and encrypted view of the event. This is named `toJSON` for use