Add a "view all results" link setting for the autocomplete dropdown

Thanks for creating this feature request. As said in the other issue 💬 Looking for help displaying the suggestions in a view Active , I think this is a good idea. (Though I’m a bit confused why this was never proposed before …)
However, I currently don’t have the time to work on any feature requests, so this will have to wait until someone else creates a working MR for this (which I’ll happily review).

isampo → changed the visibility of the branch 3511446-view-all-results to hidden.

isampo → changed the visibility of the branch 3511446-view-all-results to active.

Very initial MR added with "view all results" functionality. Does the following:

Extends the Autocompletion configuration form with:
- Show "View all results" link checkbox for enabling the results link
- Link text for setting the "view all results" link text
- Link position for selecting whether the link should appear before or after the suggestions

"View all results" administrative configuration

View all results" suggestion on the autocompletion

Some things that (at least) still need to be considered:
- Making the configuration translatable as there's now a textual value that could be present for various languages
- Currently the link is being output as a suggestion after/before the other suggestions, so there's no difference in class or type of it. For accessibility (and theming), it'd likely need to be pulled out of the suggestions listing.
- Tests

Looks like it's off to a good start! Thanks!

Maybe add an option to have it at the top and the bottom?

For sites with a longer list of suggestions, someone might scroll past the link at the top in hopes to see if what they're looking for is in the suggestions, only to go through the list and not see what they are looking for. They would then would have to scroll all the way back up to get to the see all results link.