From 9e98c02dd7c710d3a17754bc6fe1f4745a5edc5f Mon Sep 17 00:00:00 2001
From: David Taylor <david@taylorhq.com>
Date: Tue, 9 Jun 2020 23:01:07 +0100
Subject: [PATCH] FIX: Don't call cooked decorators in composer if cooked is
 unchanged

If cooked is unchanged, ember will not re-render the preview area, so we should not re-run the post-processing decorators. This can cause issues when decorateCooked functions are not idempotent.
---
 app/assets/javascripts/discourse/app/components/d-editor.js | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/app/assets/javascripts/discourse/app/components/d-editor.js b/app/assets/javascripts/discourse/app/components/d-editor.js
index 4917acc81cd..f979d7cc720 100644
--- a/app/assets/javascripts/discourse/app/components/d-editor.js
+++ b/app/assets/javascripts/discourse/app/components/d-editor.js
@@ -367,6 +367,9 @@ export default Component.extend({
       if (this.isDestroyed) {
         return;
       }
+
+      if (this.preview === cooked) return;
+
       this.set("preview", cooked);
       schedule("afterRender", () => {
         if (this._state !== "inDOM") {