BUG: `close_if_last_window` invalid command to swap to modified buffer

[bwpge]

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Neovim Version (nvim -v)

NVIM v0.9.2

Operating System / Version

Windows 11 22H2

Describe the Bug

When the close_if_last_window option is enabled, the "swap to modified buffer" scheduled function in init.lua causes the error E492: Not an editor command: .... This only happens for buffers of files on disk (not unnamed buffers), specifically on a Windows system. This does not occur on WSL for the same system.

Possible root cause:
Looking at the traceback, it looks like this occurs because the :b[uffer] command is concatenating with an absolute Windows path (e.g., starting with a partition letter) resulting in an "unknown" command such as :bC:/... (see line 310 below):

neo-tree.nvim/lua/neo-tree/setup/init.lua

Lines 306 to 311 in cfe1920

	vim.schedule(function()
	log.warn(message)
	vim.cmd("rightbelow vertical split")
	vim.api.nvim_win_set_width(win_id, state.window.width or 40)
	vim.cmd("b" .. buf_name)
	end)

Example :b test on Windows:

• Open a file in Neovim with nvim C:/foo.txt
• Both :b C:\foo.txt and :b C:/foo.txt work as expected
• Both :bC:\foo.txt and :bC:/foo.txt causes the error E492: Not an editor command: bC:...

Screenshots, Traceback

Error executing vim.schedule lua callback: vim/_editor.lua:341: nvim_exec2(): Vim:E492: Not an editor command: bC:/Users/user/AppData/Local/nvim/lua/user/plugins/neo-tree.lua
stack traceback:
        [C]: in function 'nvim_exec2'
        vim/_editor.lua:341: in function 'cmd'
        ...nvim-data/lazy/neo-tree.nvim/lua/neo-tree/setup/init.lua:310: in function <...nvim-data/lazy/neo-tree.nvim/lua/neo-tree/setup/init.lua:306>

Steps to Reproduce

1. Use Neovim on a Windows system with this plugin, minimally configured with lazy per README. Minimal init.lua provided below, but the following is the relevant plugin spec for neo-tree to create the behavior:

{
    "nvim-neo-tree/neo-tree.nvim",
    branch = "v3.x",
    dependencies = {
      "nvim-lua/plenary.nvim",
      "nvim-tree/nvim-web-devicons",
      "MunifTanjim/nui.nvim",
    },
    opts = { close_if_last_window = true },
}

2. Open Neotree with :Neotree filesystem reveal left
3. Modify an existing file on disk without saving (IMPORTANT: the file must exist on disk since the buffer name will use an absolute Windows path)
4. Attempt to close the buffer with :q and observe the error

Expected Behavior

The modified buffer is focused without causing an error.

Your Configuration

-- lazy
local lazypath = vim.fn.stdpath("data") .. "/lazy/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",
        "--branch=stable", -- latest stable release
        lazypath,
    })
end
vim.opt.rtp:prepend(lazypath)

-- load neo-tree with appropriate options
require("lazy").setup({
    {
        "nvim-neo-tree/neo-tree.nvim",
        branch = "v3.x",
        dependencies = {
            "nvim-lua/plenary.nvim",
            "nvim-tree/nvim-web-devicons",
            "MunifTanjim/nui.nvim",
        },
        opts = { close_if_last_window = true },
    },
})

[bwpge]

I've opened #1351 to fix this issue.

[bwpge]

#1351 has been merged so this issue is resolved.