[Picker] Extend layout preset

[ADIX7]

Is there an easy way to extend a preset? I would like to use ivy for several pickers but further customize it (like using different height). I know I can do this (in a lazy keys config), but how can I change the height? It would be great if https://github.com/folke/snacks.nvim/blob/main/lua/snacks/picker/config/layouts.lua would contain functions that also accept options that would be (deep)merged with the preset. Or is there someting like this, I just coudn't find?

So this works great:

{
    "<leader>pp",
    function()
        Snacks.picker.files({ layout = { preset = "ivy" } })
    end,
    desc = "Find file",
},

But I would like to do something like this:

{
    "<leader>pp",
    function()
        Snacks.picker.files({ layout = Snacks.picker.layout.ivy({height = 0.7}) })
    end,
    desc = "Find file",
},

Like with telescope:

vim.keymap.set("n", "<leader>pp", function()
    builtin.find_files(require("telescope.themes").get_ivy({                     
        layout_config = {
            height = 0.7,
        },
}))
end, { desc = "Find Files" })

[folke]

You can configure it in your general opts with opts.picker.sources.files.layout.preset = "ivy"
Or just pass {layout = {preset = "ivy"}} directlty

[folke]

Make sure to update first since I fixed some issues related to this

[ADIX7]

I mean I would like to use ivy for different pickers but with slightly different configuration. So like I would set height differently for files (eg 0.5) and grep (0.7). Is there a way to achive this without a lot of code?

For telescope we can pass a theme but at the same time we can pass other options for the theme that will overwrite the themes's default (height in my example).

[pkazmier]

@ADIX7 You can see how I make small changes to the ivy layout without retyping the whole layout here: #458