Problem: files without standard extensions (e.g. scripts with
shebangs, Makefile, Dockerfile) got incorrect or default icons since
icon providers match by filename or extension only.
Solution: add use_slow_filetype_detection option to the icon column
config. When enabled, reads the first 16 lines of each file and
passes them to vim.filetype.match for content-based detection. The
detected filetype is forwarded to mini.icons or nvim-web-devicons as
a trailing parameter, preserving backwards compatibility with
existing icon provider implementations.
Based on: stevearc/oil.nvim#618
Barrett Ruth
ded17258cd
