Customizable preview window height

[robinovitch61]

Great library! What would make it perfect for my use case is if I could limit the preview window height. For example, in fzf, I do this with:

export FZF_DEFAULT_OPTS='--height 40% --layout=reverse --border'

so that my fzf preview window never takes up more than 40% of the height of the screen.

Thanks!