[Powershell Preview regression bug] Debugger hangs when a breakpoint inside a scriptblock is hit

Issue Description

I am experiencing a problem with the debugger. It hangs when a breakpoint inside a scriptblock is hit.

Steps to reproduce:

• Paste the script as a new ps1 file, and run it.
• In the Integrated terminal type ‘Stop-Service -Name <tab>’
• The debug session is started, but it does not accept further interaction.

$s = {
    param($commandName, $parameterName, $wordToComplete, $commandAst, $fakeBoundParameters)
    Set-PSBreakpoint -command Get-Service
    $services = Get-Service | Where-Object {$_.Status -eq "Running" -and $_.Name -like "$wordToComplete*"}
    $services | ForEach-Object {
        New-Object -Type System.Management.Automation.CompletionResult -ArgumentList $_.Name,
            $_.Name,
            "ParameterValue",
            $_.Name
    }
}
Register-ArgumentCompleter -CommandName Stop-Service -ParameterName Name -ScriptBlock $s

Beyond this point, you can only kill the integrated terminal. It will not accept any other input.

NOTE: This only happens in the PowerShell Preview Extension. The GA PowerShell extension does not have this bug.

The bug is also not reproducible in a stand alone console in PowerShell 5.1, Powershell 6.2.3, or 7.0.0.rc2, or PowerShell_ise (5.1). It is specific to the Preview version of the extension.

Attached Logs

1580281742-dc8c91be-e55c-4eed-822f-c087bed38b011580281219461.zip

Environment Information

Visual Studio Code

Name	Version
Operating System	Windows_NT x64 10.0.18363
VSCode	1.41.1
PowerShell Extension Version	2020.1.0

PowerShell Information

Name	Value
PSVersion	7.0.0-rc.2
PSEdition	Core
GitCommitId	7.0.0-rc.2
OS	Microsoft Windows 10.0.18363
Platform	Win32NT
PSCompatibleVersions	1.0 2.0 3.0 4.0 5.0 5.1.10032.0 6.0.0 6.1.0 6.2.0 7.0.0-rc.2
PSRemotingProtocolVersion	2.3
SerializationVersion	1.1.0.1
WSManStackVersion	3.0

Visual Studio Code Extensions

Visual Studio Code Extensions(Click to Expand)

Extension	Author	Version
azure-account	ms-vscode	0.8.8
azure-pipelines	ms-azure-devops	1.165.1
azurecli	ms-vscode	0.4.6
bracket-pair-colorizer-2	CoenraadS	0.0.29
cmake	twxs	0.0.17
code-settings-sync	Shan	3.4.3
cpptools	ms-vscode	0.26.3
csharp	ms-vscode	1.21.9
csharpfixformat	Leopotam	0.0.84
docomment	k–kato	0.1.8
gitlab-ci-validator	cstuder	1.0.0
gitlens	eamodio	10.2.0
Go	ms-vscode	0.12.0
LiveServer	ritwickdey	5.6.1
powershell-preview	ms-vscode	2020.1.0
python	ms-python	2020.1.58038
remote-containers	ms-vscode-remote	0.94.0
remote-ssh	ms-vscode-remote	0.48.0
remote-ssh-edit	ms-vscode-remote	0.48.0
remote-wsl	ms-vscode-remote	0.41.7
swagger-viewer	Arjun	2.2.2
terraform	mauve	1.4.0
vscode-azurefunctions	ms-azuretools	0.20.2
vscode-azureterraform	ms-azuretools	0.3.0
vscode-icons	vscode-icons-team	9.7.0
vscode-markdownlint	DavidAnson	0.33.0
vscode-pull-request-github	GitHub	0.14.0
vscode-remote-extensionpack	ms-vscode-remote	0.19.0
vscode-svg-previewer	vitaliymaz	0.5.1
vscode-typescript-tslint-plugin	ms-vscode	1.2.3
vsliveshare	ms-vsliveshare	1.0.1510
vsonline	ms-vsonline	1.0.1507
xml	DotJoshJohnson	2.5.0

[Jawz84]

Agreed, thanks. Great work everyone!

[msftbot[bot]]

This issue has been marked as fixed. It has been automatically closed for housekeeping purposes.