<p></p>
<blockquote>
<p dir="auto">so it doesn't perform unnecessary geocoding anymore for the previously selected point (either source or destination), when entering second point</p>
</blockquote>
<p dir="auto">Doesn't it still do unnecessary geocoding for the first point? And then its marker may get shifted as a result of this geocoding.</p>
<p dir="auto">What an endpoint should do is to detect that it has coordinates as a value and don't try to query nominatim if it does. Search has server-side regexps to detect coordinates:<br>
<a href="https://github.com/openstreetmap/openstreetmap-website/blob/7cd900eca0af0f2eaeb54360ec8d1b9153434455/app/controllers/geocoder_controller.rb#L196">https://github.com/openstreetmap/openstreetmap-website/blob/7cd900eca0af0f2eaeb54360ec8d1b9153434455/app/controllers/geocoder_controller.rb#L196</a><br>
Here something simpler might suffice like <em>number, number</em> format without all those degree signs, N/S/E/W letters etc.</p>

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