From 54427c498dcf9ac917ee3780ef70e98b68f34229 Mon Sep 17 00:00:00 2001
From: tophf <tophf@gmx.com>
Date: Fri, 13 Aug 2021 12:15:58 +0300
Subject: [PATCH] avoid mutating DOM unnecessarily in toggleDataset()

---
 js/dom.js | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/js/dom.js b/js/dom.js
index 86ebf7c6..fb82ba8c 100644
--- a/js/dom.js
+++ b/js/dom.js
@@ -337,10 +337,11 @@ async function showSpinner(parent) {
 }
 
 function toggleDataset(el, prop, state) {
+  const wasEnabled = el.dataset[prop] != null; // avoids mutating DOM unnecessarily
   if (state) {
-    el.dataset[prop] = '';
+    if (!wasEnabled) el.dataset[prop] = '';
   } else {
-    delete el.dataset[prop];
+    if (wasEnabled) delete el.dataset[prop];
   }
 }