Prepending a minus sign to a part of a query can change it radically through autocomplete

[foolip]

Steps to reproduce:

• https://webstatus.dev/?q=available_on%3Achrome+available_on%3Afirefox+available_on%3Asafari
• Put the keyboard cursor right at the beginning of the query and type a "-"
• Hit enter, hoping to see the updated search

What happens instead is this, after typing "-":

When hitting enter, that commits the autocomplete suggestion, and I end up with the query "-available_date:chrome:2023-01-01..2024-01-01 available_on:firefox available_on:safari" instead, which isn't at all what I was trying to do.

cc @jcscottiii who I demo'd this to in a video call just now.