bug: Problems caused by using "\" and "/" in cmdline

[MOldtime]

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Neovim version (nvim -v)

NVIM v0.10.0-dev-8405649

Operating system/version

Windows 11 23H2 25982.1000

Describe the bug

I encountered two problems

The following tests are all based on opening a file

1. When using cmdline, when you enter "" followed by any characters, and then press the backspace key to clear the input, the cmdline window will not be automatically closed. video：

https://github.com/folke/noice.nvim/assets/38435967/e2432e9b-e5eb-4b72-aaae-846ff74f1588

2. Open cmdline and enter %s/. When entering /, the cursor position does not move backward. video

https://github.com/folke/noice.nvim/assets/38435967/baa60c3d-bfc6-46ca-8867-53cfee6f732a

Steps To Reproduce

Consistent with above

Expected Behavior

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/tokyonight.nvim",
  "folke/noice.nvim",
  -- add any other plugins here
}
require("lazy").setup(plugins, {
  root = root .. "/plugins",
})

vim.cmd.colorscheme("tokyonight")
-- add anything else here