[vim/vim] add -nargs=_ command argument (PR #20189)

[Maxim Kim]

It should allow user commands to have a single argument with spaces.

For example given the following Test command and TestComplete function:

vim9script
def TestComplete(A: string, _: string, : number): list
var all = ["qqqq", "aaaa", "qq aa"]
return all->matchfuzzy(A)
enddef
command! -nargs= -complete=customlist,TestComplete Test echo

:Test q a<tab> should successfully complete qq aa

Relates #20102

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You can view, comment on, or merge this pull request online at:

  https://github.com/vim/vim/pull/20189

Commit Summary

• e48b5a2 add -nargs=_ command argument

File Changes

(2 files)

• M src/ex_cmds.h (1)
• M src/usercmd.c (21)

Patch Links:

• https://github.com/vim/vim/pull/20189.patch
• https://github.com/vim/vim/pull/20189.diff

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