<p></p>
<p><b>@hlfan</b> requested changes on this pull request.</p>

<hr>

<p>In <a href="https://github.com/openstreetmap/openstreetmap-website/pull/5963#discussion_r2067558212">app/assets/javascripts/index/history-changesets-layer.js</a>:</p>
<pre style='color:#555'>>      this._highlightLayer.clearLayers();
 
     for (const changeset of this._changesets.values()) {
-      const rect = L.rectangle(changeset.bounds, this._getInteractiveStyle(changeset));
+      const rect = L.rectangle(changeset.bounds, this._getAreaStyle(changeset));
+      rect.id = changeset.id;
+      rect.addTo(this._areaLayer);
+    }
+
+    for (const changeset of this._changesets.values()) {
+      const rect = L.rectangle(changeset.bounds, this._getBorderStyle(changeset));
</pre>
<p dir="auto">But at that stage you don't need the changeset reference anymore.</p>
<div class="highlight highlight-source-js" dir="auto"><pre class="notranslate"><span class="pl-k">const</span> <span class="pl-s1">changesetAreas</span> <span class="pl-c1">=</span> <span class="pl-kos">[</span><span class="pl-kos">]</span><span class="pl-kos">;</span>
<span class="pl-k">const</span> <span class="pl-s1">changesetBorders</span> <span class="pl-c1">=</span> <span class="pl-kos">[</span><span class="pl-kos">]</span><span class="pl-kos">;</span>
<span class="pl-k">for</span> <span class="pl-kos">(</span><span class="pl-k">const</span> <span class="pl-s1">changeset</span> <span class="pl-k">of</span> <span class="pl-smi">this</span><span class="pl-kos">.</span><span class="pl-c1">_changesets</span><span class="pl-kos">.</span><span class="pl-en">values</span><span class="pl-kos">(</span><span class="pl-kos">)</span><span class="pl-kos">)</span> <span class="pl-kos">{</span>
  <span class="pl-k">const</span> <span class="pl-s1">arect</span> <span class="pl-c1">=</span> <span class="pl-v">L</span><span class="pl-kos">.</span><span class="pl-en">rectangle</span><span class="pl-kos">(</span><span class="pl-s1">changeset</span><span class="pl-kos">.</span><span class="pl-c1">bounds</span><span class="pl-kos">,</span> <span class="pl-kos">{</span> <span class="pl-c1">className</span>: <span class="pl-smi">this</span><span class="pl-kos">.</span><span class="pl-en">_getSidebarRelativeClassName</span><span class="pl-kos">(</span><span class="pl-s1">changeset</span><span class="pl-kos">)</span><span class="pl-kos">)</span> <span class="pl-kos">}</span><span class="pl-kos">)</span><span class="pl-kos">;</span>
  <span class="pl-k">const</span> <span class="pl-s1">brect</span> <span class="pl-c1">=</span> <span class="pl-v">L</span><span class="pl-kos">.</span><span class="pl-en">rectangle</span><span class="pl-kos">(</span><span class="pl-s1">changeset</span><span class="pl-kos">.</span><span class="pl-c1">bounds</span><span class="pl-kos">,</span> <span class="pl-kos">{</span> <span class="pl-c1">className</span>: <span class="pl-smi">this</span><span class="pl-kos">.</span><span class="pl-en">_getSidebarRelativeClassName</span><span class="pl-kos">(</span><span class="pl-s1">changeset</span><span class="pl-kos">)</span><span class="pl-kos">)</span> <span class="pl-kos">}</span><span class="pl-kos">)</span><span class="pl-kos">;</span>
  <span class="pl-s1">arect</span><span class="pl-kos">.</span><span class="pl-c1">id</span> <span class="pl-c1">=</span> <span class="pl-s1">brect</span><span class="pl-kos">.</span><span class="pl-c1">id</span> <span class="pl-c1">=</span> <span class="pl-s1">changeset</span><span class="pl-kos">.</span><span class="pl-c1">id</span><span class="pl-kos">;</span>
  <span class="pl-s1">changesetAreas</span><span class="pl-kos">.</span><span class="pl-en">push</span><span class="pl-kos">(</span><span class="pl-s1">arect</span><span class="pl-kos">)</span><span class="pl-kos">;</span>
  <span class="pl-s1">changesetBorders</span><span class="pl-kos">.</span><span class="pl-en">push</span><span class="pl-kos">(</span><span class="pl-s1">arect</span><span class="pl-kos">)</span><span class="pl-kos">;</span>
<span class="pl-kos">}</span>
<span class="pl-s1">changesetAreas</span><span class="pl-kos">.</span><span class="pl-en">forEach</span><span class="pl-kos">(</span><span class="pl-s1">a</span> <span class="pl-c1">=></span> <span class="pl-smi">this</span><span class="pl-kos">.</span><span class="pl-c1">_areaLayer</span><span class="pl-kos">.</span><span class="pl-en">addLayer</span><span class="pl-kos">(</span><span class="pl-s1">a</span><span class="pl-kos">)</span><span class="pl-kos">)</span><span class="pl-kos">;</span>
<span class="pl-s1">changesetBorders</span><span class="pl-kos">.</span><span class="pl-en">forEach</span><span class="pl-kos">(</span><span class="pl-s1">b</span> <span class="pl-c1">=></span> <span class="pl-smi">this</span><span class="pl-kos">.</span><span class="pl-c1">_borderLayer</span><span class="pl-kos">.</span><span class="pl-en">addLayer</span><span class="pl-kos">(</span><span class="pl-s1">b</span><span class="pl-kos">)</span><span class="pl-kos">)</span><span class="pl-kos">;</span>
<span class="pl-smi">this</span><span class="pl-kos">.</span><span class="pl-c1">_areaLayer</span><span class="pl-kos">.</span><span class="pl-en">setStyle</span><span class="pl-kos">(</span><span class="pl-kos">{</span>
  <span class="pl-c1">weight</span>: <span class="pl-c1">0</span><span class="pl-kos">,</span>
  <span class="pl-c1">fillOpacity</span>: <span class="pl-c1">0</span>
<span class="pl-kos">}</span><span class="pl-kos">)</span><span class="pl-kos">;</span>
<span class="pl-smi">this</span><span class="pl-kos">.</span><span class="pl-c1">_borderLayer</span><span class="pl-kos">.</span><span class="pl-en">setStyle</span><span class="pl-kos">(</span><span class="pl-kos">{</span>
  <span class="pl-c1">weight</span>: <span class="pl-c1">2</span><span class="pl-kos">,</span>
  <span class="pl-c1">color</span>: <span class="pl-s">"var(--changeset-border-color)"</span><span class="pl-kos">,</span>
  <span class="pl-c1">fill</span>: <span class="pl-c1">false</span>
<span class="pl-kos">}</span><span class="pl-kos">)</span><span class="pl-kos">;</span></pre></div>
<p dir="auto">No get...Style wrappers around _getSidebarRelativeClassName needed.</p>

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