Configuration option to debug or run a script without dot sourcing it

[metablaster]

Prerequisites

• [X] I have written a descriptive issue title.
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Summary

There are 3 ways to debug (or run) a script In VSCode:

1. Run -> Run Without Debugging
2. Run -> Start Debugging
3. By configuring launch.json and start debugging from action bar.

In all 3 cases a script will be dot sourced and I don't see a way to instruct debugger to call it rather than dot sourcing it.

I didn't notice this behavior until I stumbled upon a problem which you can see on SO:
"Run without debugging" or "Start debugging" giving different result than running script manually

Here is sample code:

$private:PSDefaultParameterValues = @{}
$private:PSDefaultParameterValues.Add("*:ErrorVariable", "+ErrorBuffer")

function Test-Variable
{
    [CmdletBinding()]
    param ()

    "Test-Variable private: '$($private:PSDefaultParameterValues | Out-String)'"
    "Test-Variable local: '$($local:PSDefaultParameterValues | Out-String)'"
    "Test-Variable script: '$($script:PSDefaultParameterValues | Out-String)'"
    "Test-Variable global: '$($global:PSDefaultParameterValues | Out-String)'"

    $ErrorBuffer = $PSCmdlet.GetVariableValue("ErrorBuffer")
    "Count of errors is $($ErrorBuffer.Count)"

    Write-Error -Message "sample error"

    "Count of errors is $($ErrorBuffer.Count)"
    $ErrorBuffer.Clear()
}

Test-Variable

Put it into a script and call it, the result is as expected, "one error", but when you run it with the help of PS Extension the result is unexpected because the script isn't meant to be dot sourced.

Currently it's impossible to debug or run it and have the result you want.
Debugger should not assume a user whishes to dot source a script.

Proposed Design

I propose an option to let user instruct debugger on how a script is to be executed, for example:

"powershell.debugging.executeMode = "call"

// OR

"powershell.debugging.executeMode = "dotsource"