I think that would be great if, apart from using the search_api_location location input plugins, geofield proximity source plugins could be used: it will provide html5 location, geocode and manual input.
Needs review
1.0
Code
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
I use this function now for some time and it works great. Preparing for migration to D10 and this patch seems to still do the trick with the latest search_api_location dev version. Can not use the alpha version due to issue 3048597.