* does not reliably update search highlights

[J-Fields]

To reproduce:

1. Search for something: /xyz<CR>
2. Search for something else via *
3. Notice xyz is still highlighted

This seem to be new in 1.22.0, possibly related to #7416 (pinging @adrsm108)

[adrsm108]

I see this worked on my previous build, which was 48 commits behind master, so the bug must have been introduced fairly recently. I'll take a look.

Also notable: # doesn't seem to be working at all.

[J-Fields]

Testing the commit before yours, * was working (so it does seem the inccommand change broke it somehow), but # was broken. I've split that out into its own commit since it seems to be unrelated.