fix: ignore prefix syntax not in prefix position

[thatismatt]

Fixes #1212 by ignoring the prefix syntax flag once point is inside the symbol.

I've added a few tests that hopefully illustrate the issue/expected behaviour.

[bbatsov]

@Fuco1 I'd appreciate it if you can take a look at this one, as it's affecting Clojure users. (that's how the PR came to my attention)

[fboulay]

I tried this commit, and it's not fixing the issue described in #1212

[deejayem]

I tried this commit, and it's not fixing the issue described in #1212

@fboulay it fixes the issue for me.

E.g. f|oo? -> (|foo?) (where | is the position of the cursor).

[fboulay]

@deejayem you're right. My configuration was bad, and I did not pull the right commit. This fixes the issue as well for me.

[deejayem]

@Fuco1 I've been using this since it was created, and (after the second commit) it's been working without any issues.

It would be great if this could be merged, as I know a lot of people are affected by the bug (since names ending with ? are common in Clojure).