fix(ui-select): prompt visibility, border, and fzf menu position

[willothy]

1. Title pos should be based on win_configs, not arbitrarily set. Not sure why I had it like that.
2. Ensures prompt is always visible by adding a solid top-border if border == "none"
3. Only uses virt_text value if it's a table to ensure that multiple return values from string methods like gsub are ignored.

[Bekaboo]

I also have some thoughts to improve the ui-select function, see my config here

I would like to merge my changes with yours and finally to master, but I am currently a bit busy right now and might do it after one or two weeks.

[willothy]

I also have some thoughts to improve the ui-select function, see my config here

I would like to merge my changes with yours and finally to master, but I am currently a bit busy right now and might do it after one or two weeks.

No rush, sounds good! Your changes look good as well, I'll test them out.

[willothy]

@Bekaboo I can also merge your changes into this PR if you'd like, I have some free time this week. If you would prefer to do it that's cool though, no rush.

[Bekaboo]

Sounds cool! You are welcome to do it if you have free time.

[willothy]

Sounds cool! You are welcome to do it if you have free time.

After merging in your changes and trying a few different configurations, I have noticed some edge cases with the way the fzf prompt window opens. These mostly relate to border. I am going to mark this as a draft and do some more work fixing these edge cases, and I'll request review when it's ready. I think I will likely turn all border props into arrays and modify them so that theming can be consistent while still allowing configuration.

[Bekaboo]

Close this by commit 0c3b4f6. Reopen if you have any further improvements or bug fixes.

[willothy]

Totally, sounds good! My bad, didn't end up having time to finish this.

I'll look into the edge cases I found and open a separate PR for those.