Bug with `Path:mkdir()` on Windows

[epwalsh]

This came up in https://github.com/epwalsh/obsidian.nvim/issues/88 and I think I've tracked it down to a bug with the path module here.

Running:

Path:new("C:/Users/myhome/my/local/obsidian/repo/"):mkdir { parents = true, exist_ok = true }

fails on Windows with

E5108: Error executing lua ...site\pack\packer\start\plenary.nvim/lua/plenary/path.lua:497: We couldn't mkdir: C:\Users\myhome\AppData\Local\nvim\lua\C:/Users/myhome/my/local/obsidian/repo/
stack traceback:
	[C]: in function 'error'
	...site\pack\packer\start\plenary.nvim/lua/plenary/path.lua:497: in function 'mkdir'
	[string ":source (no file)"]:601: in main chunk

Note that C:\Users\myhome\AppData\Local\nvim\lua is the path to the users configuration files where the call to mkdir() originates. So it looks like at some point mkdir() mangles the path by prepending this directory.

[p00f]

Something similar happens in https://github.com/p00f/cphelper.nvim/issues/32, but instead of the nvim directory it appends it to C:\Users\myhome instead

[bjjblackbelt]

bump

[drop-stones]

This issue has been fixed in https://github.com/nvim-lua/plenary.nvim/commit/8aad4396840be7fc42896e3011751b7609ca4119