[vim/vim] completeslash=slash prevents findfunc from opening file paths with slashes on Win32 (Issue #20770)

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Mao-Yining

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Jul 14, 2026, 11:50:05 PM (9 hours ago) Jul 14

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mao-yining created an issue (vim/vim#20770)

Steps to reproduce

When completeslash=slash is set on Windows, file paths containing slashes (/) cannot be opened via findfunc completion.

vim9script
set completeslash=slash
set findfunc=Find

def Find(arg: string, _): list<string>
  if empty(filescache)
    autocmd CmdlineLeave : ++once filescache = []
    filescache = expand('**', 1, 1)->filter((_, v) => !isdirectory(v))
  endif
  return empty(arg) ? filescache : filescache->matchfuzzy(arg)
enddef

var filescache: list<string>

Open Vim on Windows with above config
Type :find src/foo (where src/foo exists)
Select completion candidate

throw E345

Expected behaviour

don't throw E345

Version of Vim

9.2.782

Environment

MS-Windows 11

CC: @glepnir

Logs and stack traces

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Mao-Yining

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Jul 14, 2026, 11:57:43 PM (8 hours ago) Jul 14

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mao-yining left a comment (vim/vim#20770)

While set completeslash=backslash if findfunc return path with slash will also have this problem.