fix(fvm/windows): append '.bat' extention to flutter path

[vaspadi]

Problem

The plugin does not work with FVM on Windows. I tested this on two separate projects using Flutter versions 3.16.0 and 3.27.0.

When running the FlutterRun command, the following error occurs:

Error executing Lua callback:
...plenary/job.lua:406: Failed to spawn process:
command = "C:\\Users\\vasil\\fvm\\versions\\3.27.0\\bin\\flutter"
pid = "ENOENT: no such file or directory"

This happens because the plugin tries to run flutter directly, but on Windows the actual executable is flutter.bat.

Solution

If path.is_windows == true, we now append .bat to the path of the flutter binary. This fixes the issue and allows flutter-tools.nvim to work correctly with FVM on Windows.

I've been using this fix for several weeks without issues.

Environment

OS: Windows 11 Home
fvm: v3.2.1
flutter-tools.nvim: 8fa438f
Neovim: v0.10.4

Minimal Config to Reproduce

return {
  "nvim-flutter/flutter-tools.nvim",
  ft = "dart",
  dependencies = {
    "nvim-lua/plenary.nvim",
    "mfussenegger/nvim-dap",
  },
  config = function()
    require("flutter-tools").setup({
      fvm = true
    })
  end,
}

[sidlatau]

Thanks for the fix! I had simmilar PR ( #386 ) but was not able to test it.