From 47ce93d2fd1538f75e011f7d7dad722737acc470 Mon Sep 17 00:00:00 2001
From: Franz Liedke <franz@develophp.org>
Date: Fri, 11 Sep 2020 17:10:57 +0200
Subject: [PATCH] Stop rendering previews when composer is hidden

This brings this component in line with the `ReplyPlaceholder` one.
---
 js/src/forum/components/ComposerPostPreview.js | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/js/src/forum/components/ComposerPostPreview.js b/js/src/forum/components/ComposerPostPreview.js
index 390d502b3..214f4ed9f 100644
--- a/js/src/forum/components/ComposerPostPreview.js
+++ b/js/src/forum/components/ComposerPostPreview.js
@@ -24,6 +24,10 @@ export default class ComposerPostPreview extends Component {
     // body with a preview.
     let preview;
     const updatePreview = () => {
+      // Since we're polling, the composer may have been closed in the meantime,
+      // so we bail in that case.
+      if (!this.attrs.composer.isVisible()) return;
+
       const content = this.attrs.composer.fields.content();
 
       if (preview === content) return;