PowerShell script debugpy.ps1 incorrectly handles multiple arguments passed as an array

[Forever-178]

Description:

When using the PowerShell wrapper script debugpy.ps1 to debug a Python script that accepts multiple command-line arguments, the arguments are not properly passed through to the Python script when provided as an array.

Steps to Reproduce:

1. Create a test Python script (test.py):

import sys
print(sys.argv)

2. Create a PowerShell script (run.ps1):

$arg_list = @('arg1', 'arg2')
$file = "test.py"

& python $file $arg_list  # Works correctly
& debugpy $file $arg_list  # Fails - arguments are concatenated

3. Run the PowerShell script:

.\run.ps1

Actual Result:

['test.py', 'arg1', 'arg2']
['test.py', 'arg1 arg2']

Expected Result:

['test.py', 'arg1', 'arg2']
['test.py', 'arg1', 'arg2']

Root Cause:
The current debugpy.ps1 script passes $args directly to the Python command without using splatting (@args). When an array is passed to the script, PowerShell's $args receives it as a single object rather than expanding it into multiple arguments.

Current code:

if ($os -eq [System.PlatformID]::Win32NT) {
    python $env:BUNDLED_DEBUGPY_PATH --listen 0 --wait-for-client $args
} else {
    python3 $env:BUNDLED_DEBUGPY_PATH --listen 0 --wait-for-client $args
}

Proposed Fix:
Use the splatting operator (@args) instead of $args to properly expand array arguments:

if ($os -eq [System.PlatformID]::Win32NT) {
    python $env:BUNDLED_DEBUGPY_PATH --listen 0 --wait-for-client @args
} else {
    python3 $env:BUNDLED_DEBUGPY_PATH --listen 0 --wait-for-client @args
}