Buffer goes missing when using powershell

[Tyriar]

Environment

Windows build number: 10.0.18956.1000
Windows Terminal version (if applicable): 0.3.2171.0
Happens in VS Code too

Steps to reproduce

1. Run or launch a powershell terminal
2. Press enter a bunch of times (echo also triggers the behavior)

Expected behavior

Scrollback/scroll bar should appear

Actual behavior

No scroll bar

[Tyriar]

Running ls will make a scroll bar appear.

[Tyriar]

This happens if you have scroll back as well, enter just redraws the entire screen or something, rather than actually pushing a row up. So the top viewport lines just go missing.

[DHowett-MSFT]

This is actually PowerShell/PSReadLine#724. Shipping versions of PSReadline are emitting the destructive "scroll" VT sequence.

[binaryfunt]

Should I still be experiencing this bug? It only occurs when running Powershell in Terminal, and according to Get-Module -ListAvailable, I have

ModuleType Version    Name
---------- -------    ----
...
Script     2.0.0      PSReadline

Is there a fix/workaround?

[zadjii-msft]

Honestly I don't think I fully understand PSReadline versioning - I think from this diff it was fixed in PSReadline v2.0.0-beta4, but I'm not sure if that means it's in 2.0.0 or not.

@DHowett-MSFT should be able to clear things up for me.

I'm pretty sure you shouldn't be seeing this anymore.

[Tyriar]

I was confused by this as well recently, in PS6 prerelease info doesn't show up but you can get it via:

Get-Module PSReadLine | % { $_.PrivateData.PSData }

Apparently PS7 shows prerelease info when you run Get-Module PSReadLine.