I don't understand why this constant is needed

I don't remember why I choosed ADDITIONAL_CAP=10. But it is very little extra space just to make sure the last line fits in the window because of font draw that can move letters lower for correct layout

Then it should be something proportional to font_size? E.g font_size / 2

Something wrong with encapsulation here. List config is intended to be using only inside list_view.rs

Yes, but I think that state is global app with possible access to all configs. Additionaly it is very intuitive to see show_default parameter in [list_items] section, on my opinion. But I can move it to global section of Config if you want it.

1. This hack is inside input_changed, right?
2. Why it's capacity and not length?
3. Actually animation is added here, why it stated it's disabled then?

Yes, this hack inside input_changed. Length of string will be zero if we are typing something and delete it. But capacity will not be zero anymore because we don't free string. It is for first draw of yofi.
Render:

1. Run yofi
2. Draw window with height from Config
3. Try to place list_items in here
4. Truncate height to new height with removing unused height space. If it is just a first render we do not want to see this "jumping" window, but only input, thats why i added this

You could get a panic here, reproduction:

seq 100 | cargo r dialog (debug build is important)

then quickly type any two digits

Not sure whether it's related but this piece of code above gives a panic now if running in debug build. So this code should work:

let displayed_items = (((space.height - margin.top - margin.bottom + item_spacing)
    / (entry_height + item_spacing)) as usize)
    .saturating_sub(has_subname as usize);

let max_offset = self.skip_offset + displayed_items;
let (selected_item, skip_offset) = if self.selected_item < self.skip_offset {
    (0, self.selected_item)
} else if max_offset <= self.selected_item {
    (
        displayed_items.saturating_sub(1),
        self.skip_offset + (self.selected_item - max_offset) + 1,
    )
} else {
    (self.selected_item - self.skip_offset, self.skip_offset)
};