From e9ed8dc946a489a42a7b440e7a2ee5782364e793 Mon Sep 17 00:00:00 2001
From: tophf <tophf@gmx.com>
Date: Thu, 23 Dec 2021 05:09:23 +0300
Subject: [PATCH] iterate style object props just once

---
 manage/import-export.js | 15 ++++++++-------
 1 file changed, 8 insertions(+), 7 deletions(-)

diff --git a/manage/import-export.js b/manage/import-export.js
index 972b8a20..354283b9 100644
--- a/manage/import-export.js
+++ b/manage/import-export.js
@@ -341,15 +341,16 @@ async function exportToFile() {
     type,
   }).dispatchEvent(new MouseEvent('click'));
   /** strip `sections`, `null` and empty objects */
-  function cleanupStyle(s) {
-    s = Object.assign({}, s);
-    if (s.usercssData) delete s.sections;
-    for (const [key, val] of Object.entries(s)) {
-      if (typeof val === 'object' && isEmptyObj(val)) {
-        delete s[key];
+  function cleanupStyle(style) {
+    const copy = {};
+    for (const [key, val] of Object.entries(style)) {
+      if (key === 'sections'
+          ? !style.usercssData
+          : typeof val !== 'object' || !isEmptyObj(val)) {
+        copy[key] = val;
       }
     }
-    return s;
+    return copy;
   }
   function generateFileName() {
     const today = new Date();