zsh duplicates suggestions

[FlorianPommerening]

This might be related to #504 but I think it is something else: when calling the script like this python ./foo.py, I get duplicate suggestions. Of course it could also be an issue with zsh or my setup of it, so I hope other people can confirm it they also see this.

To reproduce

Test environment:

• Ubuntu 24.04
• Python 3.12.3
• argcomplete 3.1.4-1ubuntu0.1 (this is 3.1.4 with a patch back-ported from 3.3.0 to make it compatible with Python 12.3)
• zsh 5.9

I tested this with the following file foo.py

#!/usr/bin/env python3
# PYTHON_ARGCOMPLETE_OK

import argcomplete, argparse

parser = argparse.ArgumentParser()

argcomplete.autocomplete(parser)

./foo.py <TAB>        # works fine
python foo.py <TAB>   # works fine
python ./foo.py <TAB> # duplicate suggestions

Suggestions for the last option show up twice in the generated list:

--help                                                                                                                                                                                                                                                                                                                            
-h                                                                                                                                                                                                                                                                                                                                
-- show this help message and exit                                                                                                                                                                                                                                                                                                
--help                                                                                                                                                                                                                                                                                                                            
-h                                                                                                                                                                                                                                                                                                                                
-- show this help message and exit 

Output with _ARC_DEBUG=1

The suggestions are generated once with WORDS: ['python', './foo.py'] and once with WORDS: ['./foo.py'] where in both cases, LINE: 'python ./foo.py '.

python ./foo.py                                  
word ./foo.py split, lexer state: ' '
In trailing whitespace

LINE: 'python ./foo.py ' 
POINT: 16 
PREQUOTE: '' 
PREFIX: '' 
SUFFIX: '' 
WORDS: ['python', './foo.py']
Active parsers: [MonkeyPatchedIntrospectiveArgumentParser(prog='foo.py', usage=None, description=None, formatter_class=<class 'argparse.HelpFormatter'>, conflict_handler='error', add_help=True)]
Visited positionals: [MonkeyPatchedIntrospectiveArgumentParser(prog='foo.py', usage=None, description=None, formatter_class=<class 'argparse.HelpFormatter'>, conflict_handler='error', add_help=True)]
invoking parser with ['./foo.py']
parsed args: (Namespace(), ['./foo.py'])
all active parsers: [MonkeyPatchedIntrospectiveArgumentParser(prog='foo.py', usage=None, description=None, formatter_class=<class 'argparse.HelpFormatter'>, conflict_handler='error', add_help=True)]
active_parser: MonkeyPatchedIntrospectiveArgumentParser(prog='foo.py', usage=None, description=None, formatter_class=<class 'argparse.HelpFormatter'>, conflict_handler='error', add_help=True)
optional options: ['-h', '--help']
next_positional: None
Active actions (L=0): []
active options: ['-h', '--help']
display completions: {'-h': 'show this help message and exit', '--help': 'show this help message and exit'}

Returning completions: ['-h:show this help message and exit', '--help:show this help message and exit']

word ./foo.py split, lexer state: ' '
In trailing whitespace

LINE: 'python ./foo.py ' 
POINT: 16 
PREQUOTE: '' 
PREFIX: '' 
SUFFIX: '' 
WORDS: ['./foo.py']
Active parsers: [MonkeyPatchedIntrospectiveArgumentParser(prog='foo.py', usage=None, description=None, formatter_class=<class 'argparse.HelpFormatter'>, conflict_handler='error', add_help=True)]
Visited positionals: [MonkeyPatchedIntrospectiveArgumentParser(prog='foo.py', usage=None, description=None, formatter_class=<class 'argparse.HelpFormatter'>, conflict_handler='error', add_help=True)]
invoking parser with []
parsed args: (Namespace(), [])
all active parsers: [MonkeyPatchedIntrospectiveArgumentParser(prog='foo.py', usage=None, description=None, formatter_class=<class 'argparse.HelpFormatter'>, conflict_handler='error', add_help=True)]
active_parser: MonkeyPatchedIntrospectiveArgumentParser(prog='foo.py', usage=None, description=None, formatter_class=<class 'argparse.HelpFormatter'>, conflict_handler='error', add_help=True)
optional options: ['-h', '--help']
next_positional: None
Active actions (L=0): []
active options: ['-h', '--help']
display completions: {'-h': 'show this help message and exit', '--help': 'show this help message and exit'}

Returning completions: ['-h:show this help message and exit', '--help:show this help message and exit']