Describe the bug

I have completions (via the autocompletion keyword argument in Arguments and Options) that include a colon (:) in the string. In zsh, these completions get split into completion candidates and help texts at the colon.

To Reproduce

• Create a file main.py with:

import typer

images = ["alpine:latest", "nvidia/cuda:10.0-devel-ubuntu18.04"]

def _complete(value: str) -> str:
    for image in images:
        if image.startswith(value):
            yield value

app = typer.Typer()

@app.command("image")
def hello(name: str = typer.Option(..., autocompletion=_complete)):
    typer.echo(name)

if __name__ == "__main__":
    app()

• Trigger autocompletion with [TAB] on ZSH

$ <app_entrypoint> image --name [TAB]

• It outputs:

$ <app_entrypoint> image --name [TAB]
alpine       -- latest
nvidia/cuda  -- 10.0-devel-ubuntu18.04

When I cycle through the completion candidates, only alpine and nvidia/cuda gets filled in.

• But I expected it to output:

$ <app_entrypoint> image --name [TAB]
alpine:latest
nvidia/cuda:10.0-devel-ubuntu18.04

Environment

• OS: Ubuntu 18.04
• Typer Version: 0.3.2
• Python version: 3.7.9
• Zsh version: 5.4.2 (x86_64-ubuntu-linux-gnu)

Additional context

I tried the exact same thing in Bash, and it worked as expected (the output in "But I expected it to output").