Steps to reproduce:

• Get the Anyware Services coordinates on https://www.coordonnees-gps.fr/
  
• Open a geocode widget
• Copy/paste the coordinates (43.542240142822266,1.510043978691101)
• Search for the point
• The point is moved to the building next to the initial coordinates
  

This can cause troubles when address is unknown by the Nominatim. Coordinates should be kept intact.

Two solutions:

1. Detect that the "address" is coordinates
2. Be able to fill the coordinates with the format (+|-)?[0-9]+\.[0-9]+,( )?(+|-)?[0-9]+\.[0-9]+ directly in the form.
   

PS: Think about modification into a grid/search results.