Dynamic floating window?

[tmpm697]

• I have fzf 0.30.0 or above
• I have read through https://github.com/junegunn/fzf.vim/blob/master/README.md
• I have read through https://github.com/junegunn/fzf/blob/master/README-VIM.md
• I have read through the manual page of fzf (man fzf)
• I have searched through the existing issues

There're some similar issues here that closed as wontfix: #632 #1155

But I think these requests are reasonable, I want to have like max_height, max_width but if number of candidates are lower than those, let shrink the floating window size.

I think I can suffer the cost of waiting for all candidates populated before seeing the floating window but I want it to take the exact space it needed rather than a fix window size.