Completion of FilePath adds space in zsh

[windsource]

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Rust Version

rustc 1.91.0 (f8297e351 2025-10-28)

Clap Version

clap 4.5.51, clap_complete 4.5.60

Minimal reproducible code

use std::path::PathBuf;

use clap::{CommandFactory, Parser, ValueHint};
use clap_complete::CompleteEnv;

#[derive(Parser, Debug, PartialEq)]
#[command(name = "mycomp")]
struct Opt {
    #[arg(value_hint = ValueHint::FilePath)]
    file: PathBuf,
}

fn main() {
    CompleteEnv::with_factory(|| Opt::command()).complete();
    let opt = Opt::parse();

    println!("{:#?}", opt.file);
}

Steps to reproduce the bug with the above code

If the binary is called mycomp, then in zsh (not bash!):

source <(COMPLETE=zsh mycomp)

Then assume your current folder looks like

. -
  +- sub1
     +- sub2

Then using completion like

mycomp <TAB>

Actual Behaviour

You get

mycomp sub1/<SPACE>

so pressing tab again will not show sub2. In bash the behavior is correct (not adding space here).

Expected Behaviour

If there are still files or sub folders available for completion, no space should be added (same as in bash).

Additional Context

Based on discussion in #6176

Debug Output

No response