Problem: vim.fs.root uses vim.fn.fnamemodify. vim.fn table isn't
available from nvim -ll or thread contexts.
Solution: Swap out vim.fn.fnamemodify for vim.fs.abspath.
This is a temporary workaround and may be reverted since the
long-term plan is to use more fast=true "fn" functions from vim.fs
where possible.
825e182139
