<p></p>
<p><b>@AntonKhorev</b> commented on this pull request.</p>

<hr>

<p>In <a href="https://github.com/openstreetmap/openstreetmap-website/pull/5964#discussion_r2071771384">app/assets/javascripts/index/history-changesets-layer.js</a>:</p>
<pre style='color:#555'>> @@ -119,14 +119,12 @@ OSM.HistoryChangesetsLayer = L.FeatureGroup.extend({
     const changeset = this._changesets.get(id);
     if (!changeset) return;
 
-    let highlightRect = this._highlightLayer.getLayer(id);
-    if (!state && highlightRect) {
-      this._highlightLayer.removeLayer(highlightRect);
-    }
-    if (state && !highlightRect) {
-      highlightRect = L.rectangle(changeset.bounds, this._getHighlightStyle(changeset));
+    if (state) {
+      const highlightRect = L.rectangle(changeset.bounds, this._getHighlightStyle(changeset));
</pre>
<p dir="auto">Overriding <code class="notranslate">getLayerId</code> to check if the layer is added by id is also not documented, but <a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/jfirebaugh/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://github.com/jfirebaugh">@jfirebaugh</a> made it work both here <a class="commit-link" data-hovercard-type="commit" data-hovercard-url="https://github.com/openstreetmap/openstreetmap-website/commit/a56d1036d58d45777d6adeffd5a950519bc70318/hovercard" href="https://github.com/openstreetmap/openstreetmap-website/commit/a56d1036d58d45777d6adeffd5a950519bc70318"><tt>a56d103</tt></a> and in Leaflet <a class="issue-link js-issue-link" data-error-text="Failed to load title" data-id="13027964" data-permission-text="Title is private" data-url="https://github.com/Leaflet/Leaflet/issues/1581" data-hovercard-type="pull_request" data-hovercard-url="/Leaflet/Leaflet/pull/1581/hovercard" href="https://github.com/Leaflet/Leaflet/pull/1581">Leaflet/Leaflet#1581</a>.</p>

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