PowerShell tab completion doesn't work for Write cmdlets when variable is in quotes

[powershellpr0mpt]

• VSCode Version: Code 1.13.1 (379d2ef, 2017-06-14T18:21:47.485Z)
• OS Version: Windows_NT ia32 10.0.15063
• Extensions:

Extension	Author	Version
PowerShell	ms-vscode	1.3.2

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Steps to Reproduce:

1. Create a variable with
2. Type any of the PowerShell Write-cmdlets [Write-Output/Host/Warning/Error] and open quotes "
3. Type $ to reference a variable and try tab completion.

Expected behaviour is VSCode simply providing a list of available variable, similar to when no quotes are used.

See attached .gif for easily reproduced example

Reproduction Code:

$test = 1
Write-Output "$t

and try tab completing the variable

[ramya-rao-a]

This issue was moved to PowerShell/vscode-powershell#885