<h3 dir="auto">Issue:</h3>
<p dir="auto">See <a class="issue-link js-issue-link" data-error-text="Failed to load title" data-id="3603013393" data-permission-text="Title is private" data-url="https://github.com/openstreetmap/openstreetmap-website/issues/6509" data-hovercard-type="issue" data-hovercard-url="/openstreetmap/openstreetmap-website/issues/6509/hovercard" href="https://github.com/openstreetmap/openstreetmap-website/issues/6509">#6509</a></p>
<p dir="auto">Map zooms out unexpectedly when closing Changeset History during zoom animation</p>
<h3 dir="auto">Cause:</h3>
<p dir="auto">When zooming the map, opening the History sidebar, or clicking a changeset, the moveEndListener is triggered.</p>
<p dir="auto">Inside moveEndListener, location.pathname is /history, which causes loadFirstChangesets to be called.</p>
<p dir="auto">loadFirstChangesets then calls updateMap().</p>
<p dir="auto">Since loadFirstChangesets is asynchronous (due to fetch), if the History sidebar is closed while it is still executing, location.pathname changes to /.</p>
<p dir="auto">This leads to map.fitBounds() being triggered, causing the map to zoom unexpectedly.</p>
<h3 dir="auto">Solution:</h3>
<p dir="auto">Store whether the current page is /history in a variable isHistory before executing the fetch in loadFirstChangesets() and loadMoreChangesets().</p>
<p dir="auto">This prevents changes to pathname during the fetch from causing unintended calls to map.fitBounds() and ensures the map does not zoom unexpectedly.</p>
<h3 dir="auto">Screenshots</h3>
<p dir="auto">old version:</p>
<p dir="auto"><a href="https://github.com/user-attachments/assets/16283fd0-7abb-4b93-ae29-4b356b148b23">https://github.com/user-attachments/assets/16283fd0-7abb-4b93-ae29-4b356b148b23</a></p>
<p dir="auto">new version:</p>
<p dir="auto"><a href="https://github.com/user-attachments/assets/58acd6bf-7c2d-42bc-bba1-c860a1e38bfe">https://github.com/user-attachments/assets/58acd6bf-7c2d-42bc-bba1-c860a1e38bfe</a></p>

<hr>

<h4>You can view, comment on, or merge this pull request online at:</h4>
<p>  <a href='https://github.com/openstreetmap/openstreetmap-website/pull/6520'>https://github.com/openstreetmap/openstreetmap-website/pull/6520</a></p>

<h4>Commit Summary</h4>
<ul>
  <li><a href="https://github.com/openstreetmap/openstreetmap-website/pull/6520/commits/333ce6eb7ea35d42ddfd74443ee2debb53fbfdac" class="commit-link">333ce6e</a>  Remove unnecessary map bounds adjustment on exiting changeset history</li>
</ul>

<h4 style="display: inline-block">File Changes </h4> <p style="display: inline-block">(<a href="https://github.com/openstreetmap/openstreetmap-website/pull/6520/files">1 file</a>)</p>
<ul>
  <li>
    <strong>M</strong>
    <a href="https://github.com/openstreetmap/openstreetmap-website/pull/6520/files#diff-25cab16df4a58e0c8e53d0a0e70d9bbf28ef3beb9e6bf1208234fdeed7515392">app/assets/javascripts/index/history.js</a>
    (12)
  </li>
</ul>

<h4>Patch Links:</h4>
<ul>
  <li><a href='https://github.com/openstreetmap/openstreetmap-website/pull/6520.patch'>https://github.com/openstreetmap/openstreetmap-website/pull/6520.patch</a></li>
  <li><a href='https://github.com/openstreetmap/openstreetmap-website/pull/6520.diff'>https://github.com/openstreetmap/openstreetmap-website/pull/6520.diff</a></li>
</ul>

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