From 79990f7e015950e4d199917b89c15d402108e712 Mon Sep 17 00:00:00 2001
From: JC Brand <jc@opkode.com>
Date: Fri, 11 Jan 2019 18:38:09 +0100
Subject: [PATCH] Don't unnecessarily set height on textarea

---
 CHANGES.md               | 1 +
 dist/converse.js         | 8 ++++++--
 src/converse-chatview.js | 7 +++++--
 3 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/CHANGES.md b/CHANGES.md
index ed8410204..ee305da4e 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -5,6 +5,7 @@
 - Bugfix: MUC commands were being ignored
 - Bugfix: Multiple rooms shown active in the rooms list
 - Bugfix: Don't open chats when receiving messages without a `body`
+- Bugfix: Typing in the textarea can become very slow in large MUCs
 - UI: Always show the OMEMO lock icon (grayed out if not available).
 - Use `publish-options` with `pubsub#access_model` set to `open` when publishing OMEMO public keys and devices
 - Add a new `converse-pubsub` plugin, for generic PubSub operations
diff --git a/dist/converse.js b/dist/converse.js
index b3ac28e60..d85433cfd 100644
--- a/dist/converse.js
+++ b/dist/converse.js
@@ -50420,9 +50420,13 @@ _converse_headless_converse_core__WEBPACK_IMPORTED_MODULE_5__["default"].plugins
       },
 
       inputChanged(ev) {
-        ev.target.style.height = 'auto'; // Fixes weirdness
+        const new_height = ev.target.scrollHeight + 'px';
 
-        ev.target.style.height = ev.target.scrollHeight + 'px';
+        if (ev.target.style.height !== new_height) {
+          ev.target.style.height = 'auto'; // Fixes weirdness
+
+          ev.target.style.height = new_height;
+        }
       },
 
       clearMessages(ev) {
diff --git a/src/converse-chatview.js b/src/converse-chatview.js
index 4760277eb..b3fc79dde 100644
--- a/src/converse-chatview.js
+++ b/src/converse-chatview.js
@@ -1008,8 +1008,11 @@ converse.plugins.add('converse-chatview', {
             },
 
             inputChanged (ev) {
-                ev.target.style.height = 'auto'; // Fixes weirdness
-                ev.target.style.height = (ev.target.scrollHeight) + 'px';
+                const new_height = ev.target.scrollHeight + 'px';
+                if (ev.target.style.height !== new_height) {
+                    ev.target.style.height = 'auto'; // Fixes weirdness
+                    ev.target.style.height = new_height;
+                }
             },
 
             clearMessages (ev) {