From d955af59600516cdc14a3bb940fc58dc28896392 Mon Sep 17 00:00:00 2001
From: Robin Ward <robin.ward@gmail.com>
Date: Mon, 30 Oct 2017 16:14:20 -0400
Subject: [PATCH] FEATURE: Allow widgets to call `_super()` when reopened

---
 .../javascripts/discourse/widgets/widget.js.es6  | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/app/assets/javascripts/discourse/widgets/widget.js.es6 b/app/assets/javascripts/discourse/widgets/widget.js.es6
index 022625168f4..f5822f8fa9b 100644
--- a/app/assets/javascripts/discourse/widgets/widget.js.es6
+++ b/app/assets/javascripts/discourse/widgets/widget.js.es6
@@ -133,7 +133,21 @@ export function reopenWidget(name, opts) {
     opts.html = opts.template;
   }
 
-  Object.keys(opts).forEach(k => existing.prototype[k] = opts[k]);
+  Object.keys(opts).forEach(k => {
+    let old = existing.prototype[k];
+
+    if (old) {
+      // Add support for `this._super()` to reopened widgets if the prototype exists in the
+      // base object
+      existing.prototype[k] = function(...args) {
+        let ctx = Object.create(this);
+        ctx._super = (...superArgs) => old.apply(this, superArgs);
+        return opts[k].apply(ctx, args);
+      };
+    } else {
+      existing.prototype[k] = opts[k];
+    }
+  });
   return existing;
 }