<p dir="auto">As reported in <a class="issue-link js-issue-link" data-error-text="Failed to load title" data-id="1623729009" data-permission-text="Title is private" data-url="https://github.com/openstreetmap/openstreetmap-website/issues/3971" data-hovercard-type="issue" data-hovercard-url="/openstreetmap/openstreetmap-website/issues/3971/hovercard" href="https://github.com/openstreetmap/openstreetmap-website/issues/3971">#3971</a>, some URLs like <a href="https://www.openstreetmap.org/?mlat=53.32607&mlon=-1.49033" rel="nofollow">https://www.openstreetmap.org/?mlat=53.32607&mlon=-1.49033</a> reset the currently selected layers. In order to restore the previous setting, a user needs to select both map and overlay layers after click on the link.</p>
<p dir="auto">It seems a bit premature to simply override the current layers, in case the link does not include any layer information.</p>
<p dir="auto">Instead, this PR unconditionally extracts the current layers from the _osm_location cookie, so it can be applied consistently across different url parsing alterantives.</p>
<p dir="auto">As before, if the link includes layers in the hash value, that information takes precedence.</p>
<p dir="auto">This change mainly impacts line 144 below:</p>
<pre class="notranslate"><code class="notranslate">mapParams.layers = hash.layers || (loc && loc[3]) || '';
</code></pre>
<p dir="auto">loc[3] will now always contain  the selected layers, as long as the cookie is available.</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/5529'>https://github.com/openstreetmap/openstreetmap-website/pull/5529</a></p>

<h4>Commit Summary</h4>
<ul>
  <li><a href="https://github.com/openstreetmap/openstreetmap-website/pull/5529/commits/18fd80ebb77b75622fb60bfa5ec64878a0c7bdc4" class="commit-link">18fd80e</a>  Consistent usage of layer information in _osm_location cookie</li>
</ul>

<h4 style="display: inline-block">File Changes </h4> <p style="display: inline-block">(<a href="https://github.com/openstreetmap/openstreetmap-website/pull/5529/files">1 file</a>)</p>
<ul>
  <li>
    <strong>M</strong>
    <a href="https://github.com/openstreetmap/openstreetmap-website/pull/5529/files#diff-a9b88a8a3644f944b9bd54361da588c69fa6a210cf7327194c17895a8ad2b0d6">app/assets/javascripts/osm.js.erb</a>
    (7)
  </li>
</ul>

<h4>Patch Links:</h4>
<ul>
  <li><a href='https://github.com/openstreetmap/openstreetmap-website/pull/5529.patch'>https://github.com/openstreetmap/openstreetmap-website/pull/5529.patch</a></li>
  <li><a href='https://github.com/openstreetmap/openstreetmap-website/pull/5529.diff'>https://github.com/openstreetmap/openstreetmap-website/pull/5529.diff</a></li>
</ul>

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