Clear-Host does not clear terminal window

[AlexHimself]

Issue Description

Clear-Host does not clear the powershell terminal window, but appears to do so. If you scroll up, there's a bunch of text that shouldn't be there.

Run the following code a couple of times and scroll around to see:

Clear-Host

[xml]$Doc = New-Object System.Xml.XmlDocument
$dec = $Doc.CreateXmlDeclaration("1.0","UTF-8",$null)
$doc.AppendChild($dec)
$text = @"

Test commment
Generated $(Get-Date)
v1.0

"@

$doc.AppendChild($doc.CreateComment($text))

Clear-Host

$doc.OuterXml

Attached Logs

Follow the instructions in the README about capturing and sending logs.

Environment Information

Windows 10 Pro (18362.86)

Visual Studio Code

Name	Version
Operating System	Windows_NT x64 10.0.18362
VSCode	1.33.1
PowerShell Extension Version	1.12.1

PowerShell Information

Name	Value
PSVersion	5.1.18362.1
PSEdition	Desktop
PSCompatibleVersions	1.0 2.0 3.0 4.0 5.0 5.1.18362.1
BuildVersion	10.0.18362.1
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| |---|---|---| |azure-account|ms-vscode|0.8.2| |gitlens|eamodio|9.7.1| |powershell|ms-vscode|1.12.1| |powershellprotools|ironmansoftware|4.5.1| |team|ms-vsts|1.149.2| |vscode-azurefunctions|ms-azuretools|0.17.0| |vscode-gist|kenhowardpdx|3.0.3|;

[SydneyhSmith]

Thanks for reporting this...This is not an isolated issue to the PowerShell Integrated Console issue...if you open up a regular "PowerShell" terminal in VSCode - note that this is the PowerShell console. Execute 1..100 and then cls. Note that you can still scroll back through the terminal history. This is a function of the terminal feature in VSCode. You can clear that terminal history using Ctrl+k. See microsoft/vscode#50225 for more details.

[SteveL-MSFT]

See https://github.com/PowerShell/PowerShell/issues/8606

[TylerLeonhardt]

I have some PR's out to address this since it's highly requested - https://github.com/PowerShell/vscode-powershell/pull/2316

[fourthborngoose]

[System.Console]::Clear() should work. Not ideal, but should still do the needful.

[ghost]

Thank you for your comment, but please note that this issue has been closed for over a week. For better visibility, consider opening a new issue with a link to this instead.