bug: vim.fn.confirm does not accept endline characters

[luiz00martins]

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Neovim version (nvim -v)

NVIM v0.9.0-dev-1292+geac75a971

Operating system/version

Windows 10 Home 19044.2728

Describe the bug

Text being displayed by vim.fn.confirm (among others) does not accept endline characters. They are automatically removed if present.

If the text is particularly long, it will overrun the screen (i.e. be extended outside the screen space).

---

Note: Found in james1236/backseat.nvim#10

Steps To Reproduce

1. Install noice.
2. Execute vim.fn.confirm with endlines in the text (such as :lua vim.fn.confirm(string.rep('abdce\n', 3)))

The endlines will be consumed.

---

1. Install noice.
2. Execute a long vim.fn.confirm command (such as :lua vim.fn.confirm(string.rep('abdce\n', 200)))

The popup will extend outside of the screen.

Expected Behavior

Keep newlines and adapt the height of the popup to the necessary size to display the full message.

Repro

-- DO NOT change the paths and don't remove the colorscheme
local root = vim.fn.fnamemodify("./.repro", ":p")

-- set stdpaths to use .repro
for _, name in ipairs({ "config", "data", "state", "cache" }) do
  vim.env[("XDG_%s_HOME"):format(name:upper())] = root .. "/" .. name
end

-- bootstrap lazy
local lazypath = root .. "/plugins/lazy.nvim"
if not vim.loop.fs_stat(lazypath) then
  vim.fn.system({ "git", "clone", "--filter=blob:none", "https://github.com/folke/lazy.nvim.git", lazypath, })
end
vim.opt.runtimepath:prepend(lazypath)

-- install plugins
local plugins = {
  "folke/noice.nvim",
}
require("lazy").setup(plugins, {
  root = root .. "/plugins",
})