ack search: no way to know the search finished

[emmanueltouzery]

when I trigger a text search in the project using ack: SPC s k p, there is no GUI way from emacs to find out whether the search was completed.
So if there are no results, I can't know whether there are no results, or there are no results yet. And when I see 5 results, I don't know if that is all, or new ones may be coming.

I think we really need some sort of indication whether the search is still ongoing or has concluded by now. Obviously it must also reset anytime the user edits the search text.

[github-actions]

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