Different Preview Behavior for debugging

[PrzemyslawKlys]

Issue Description

I am experiencing a problem with... debugging. I set a breakpoint as I would normally do. The code stops.

I see what I want to see - I press SHIFT+F5 to stop PowerShell and fix the issues.

In production the code is stopped, and nothing more is happening. In Preview the data that is currently in place seems to flow to terminal.

Normally you should be able to reproduce it with something similar to:

for ($i = 0; $i -lt 10; $i++) {
    'test'
}

After it hits breakpoint, when you do Shift + F5 it will throw everything else into the

But while working on this easy to use example I seem to hit #2175 issue all the time. After I run the code, nothing happens (F5 stops working). And after I restart PowerShell

And can't run any code either. I have to close VSCode to be able to work again.. however finally I was able to run different code, and again try to build a working example:

$Testor = for ($i = 0; $i -lt 10; $i++) {
    $Tes2 = for ($i = 0; $i -lt 10; $i++) {
        'test'
    }
    $Tes2
    'test'

}
$Testor

It will display all tests from Tes2.

But I can pretty much catch #2175 90% of the time using:

for ($i = 0; $i -lt 10; $i++) {
    'test'
}

Sorry for mixing up two problems, but it just came while I was trying to reproduce so maybe related.

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Environment Information

Visual Studio Code

Name	Version
Operating System	Windows_NT x64 10.0.17763
VSCode	1.39.2
PowerShell Extension Version	2019.11.1

PowerShell Information

Name	Value
PSVersion	5.1.17763.771
PSEdition	Desktop
PSCompatibleVersions	1.0 2.0 3.0 4.0 5.0 5.1.17763.771
BuildVersion	10.0.17763.771
CLRVersion	4.0.30319.42000
WSManStackVersion	3.0
PSRemotingProtocolVersion	2.3
SerializationVersion	1.1.0.1

Visual Studio Code Extensions

Visual Studio Code Extensions(Click to Expand)

Extension	Author	Version
beautify	HookyQR	1.5.0
gitlens	eamodio	10.1.2
material-icon-theme	PKief	3.9.1
open-in-browser	techer	2.0.0
powershell-preview	ms-vscode	2019.11.1
theme-monokai-pro-vscode	monokai	1.1.14
vscode-tldr	bmuskalla	1.0.0
vscode-wakatime	WakaTime	2.2.1

[rjmholt]

I wonder if this is a semantic issue for us. In most languages, leaving the debugger means "detach the debugger and allow the program to continue", but in PowerShell I think the norm is "end execution of the program I'm debugging". If that's the case, the solution is to get the script to terminate immediately in the detach handler.

[PrzemyslawKlys]

To be honest with the way PowerShell behaves I'm not sure leaving it as it is a good idea. Because if I want to continue I just remove breakpoints and it will continue. If I want to stop, it means STOP.

The behavior I'm referring to is that you don't need to assign variables and it goes up. In case of my HTML module when I stop debugging I get full HTML 50 pages long thrown into a console (because it doesn't just continue to run saving to file and all) but throws everything out to console.

[rjmholt]

Because if I want to continue I just remove breakpoints and it will continue. If I want to stop, it means STOP.

Indeed, that's what I meant above. Although other languages treat this like that, I think in our case the expectation is for script execution to stop immediately.

[TylerLeonhardt]

I think wrt other languages, a decent amount follow this model:

launch requests will give you the ability to STOP the code that's running (spin down a web server, stop a script from continuing, etc) where attach requests typically just detach from the attached process but leave it running.

[rjmholt]

launch requests will give you the ability to STOP the code that's running (spin down a web server, stop a script from continuing, etc) where attach requests typically just detach from the attached process but leave it running.

That makes sense to me

[andyleejordan]

Ok @PrzemyslawKlys I'm assuming this one was closed as irrelevant today lol

[PrzemyslawKlys]

Yes, it no longer acts like that. So I closed it.