[vim/vim] netrw: allow underscore in hostname? (Issue #20344)

[依云]

lilydjwg created an issue (vim/vim#20344)

Steps to reproduce

1. vim scp://_gateway/a.txt
2. netrw refuses to do it: Rejecting invalid hostname: <_gateway>

Expected behaviour

Hostnames with underscore are accepted. ssh / ping / rsync / adb / mpv / etc accept them, and systemd is actively using them (e.g. _gateway is defined by systemd).

I named my hosts with an underscore because programs (e.g. Vim) generally take "-" as a word separator but not "_".

Version of Vim

9.2.541

Environment

Arch Linux, GNOME Terminal.

Logs and stack traces

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