VSCode - Integrated Terminal not clearing multi-lines entry when pressing ESC key.

[MaximoTrinidad]

OS Version:
PowerShell Extension:

System Details

• Operating system name and version: Windows 10 Insider Build 16257
• VS Code version: VSCode Version: 1.16.0-insider
• PowerShell extension version: 1.4.1
• Output from $PSVersionTable: (See below)

PS C:\Users\mtrinidad\OneDrive\MyDocs\MyCrossPlatCode\CrossPlatScripts> code -v
1.15.0
8b95971d8cccd3afd86b35d4a0e098c189294ff2
PS C:\Users\mtrinidad\OneDrive\MyDocs\MyCrossPlatCode\CrossPlatScripts> $pseditor.EditorServicesVersion

Major  Minor  Build  Revision
-----  -----  -----  --------
1      4      1      0


PS C:\Users\mtrinidad\OneDrive\MyDocs\MyCrossPlatCode\CrossPlatScripts> code --list-extensions --show-versions
donjayamanne.python@0.7.0
formulahendry.code-runner@0.6.33
georgewfraser.vscode-javac@0.0.46
jchannon.csharpextensions@1.3.0
ms-mssql.mssql@1.1.0
ms-vscode.csharp@1.12.1
ms-vscode.PowerShell@1.4.1
robertohuertasm.vscode-icons@7.12.0

PS C:\Users\mtrinidad\OneDrive\MyDocs\MyCrossPlatCode\CrossPlatScripts> $PSVersionTable

Name                           Value
----                           -----
PSVersion                      6.0.0-beta
PSEdition                      Core
GitCommitId                    v6.0.0-beta.5
OS                             Microsoft Windows 10.0.16257
Platform                       Win32NT
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0...}
PSRemotingProtocolVersion      2.3
SerializationVersion           1.1.0.1
WSManStackVersion              3.0

Issue Description

Integrated Terminal PowerShell not clearing multi-lines entry when pressing ESC key. Please see Mike Robbins video tweet:
Mike F Robbins @mikefrobbins
@daviwil When pressing escape in the #PowerShell integrated terminal within #VSCode, only the first line of a multi-line command is removed. https://twitter.com/mikefrobbins/status/897831328233775104/video/1