Untitled-1 file opened with PowerShell type causes Powershell Integrated Console to crash

[viloun]

System Details

System Details Output

### VSCode version: 1.29.1 bc24f98b5f70467bc689abf41cc5550ca637088e x64
### VSCode extensions:
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### PSES version: 1.10.1.0

### PowerShell version:

Name                           Value
----                           -----
PSVersion                      5.1.14393.693
PSEdition                      Desktop
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0...}
BuildVersion                   10.0.14393.693
CLRVersion                     4.0.30319.42000
WSManStackVersion              3.0
PSRemotingProtocolVersion      2.3
SerializationVersion           1.1.0.1

Issue Description

When creating a temp file, and changing the syntax highlighting to Powershell, the Powershell Integrated Console crashes and never returns. I have to delete the Untitled-1 temp file from my vscode workspace and restart vscode.

Expected Behaviour

The Powershell Integrated Console should not crash. It does not matter if the Untitled-1 is valid or an invalid Powershell command.

Actual Behaviour

Powershell Integrated Console crashes and it does not reload automatically.

Attached Logs

Follow the instructions in the [troubleshooting docs](https://github.com/PowerShell/vscode-powershell/blob/master/docs/troubleshooting.md#logs
1544570084-07e1b270-cb07-403f-a3b4-63d71abe978e1544570070070.zip
)
about capturing and sending logs.

[rjmholt]

Crash in the logs seems to be here:

2018-12-11 17:16:29.087 [ERROR] tid:6 in 'OnListenTaskCompleted' C:\PowerShellEditorServices\src\PowerShellEditorServices.Protocol\MessageProtocol\ProtocolEndpoint.cs: line 391
    ProtocolEndpoint message loop terminated due to unhandled exception:
    
    System.AggregateException: One or more errors occurred. ---> System.ArgumentException: The path is not of a legal form.
       at System.IO.Path.NewNormalizePathLimitedChecks(String path, Int32 maxPathLength, Boolean expandShortPaths)
       at System.IO.Path.NormalizePath(String path, Boolean fullCheck, Int32 maxPathLength, Boolean expandShortPaths)
       at System.IO.Path.InternalGetDirectoryName(String path)
       at Microsoft.PowerShell.EditorServices.ScriptFile.ParseFileContents()
       at Microsoft.PowerShell.EditorServices.Workspace.GetFileBuffer(String filePath, String initialBuffer)
       at Microsoft.PowerShell.EditorServices.Protocol.Server.LanguageServer.HandleDidOpenTextDocumentNotification(DidOpenTextDocumentParams openParams, EventContext eventContext)
       at Microsoft.PowerShell.EditorServices.Protocol.MessageProtocol.MessageDispatcher.<>c__DisplayClass6_0`2.<SetEventHandler>b__0(Message eventMessage, MessageWriter messageWriter)
       at Microsoft.PowerShell.EditorServices.Protocol.MessageProtocol.MessageDispatcher.<DispatchMessage>d__7.MoveNext()
    --- End of stack trace from previous location where exception was thrown ---
       at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
       at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
       at Microsoft.PowerShell.EditorServices.Protocol.MessageProtocol.ProtocolEndpoint.<ListenForMessages>d__36.MoveNext()
    --- End of stack trace from previous location where exception was thrown ---
       at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
       at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
       at Microsoft.PowerShell.EditorServices.Utility.AsyncContext.Start(Func`1 asyncMainFunc, ILogger logger)
       at System.Threading.Tasks.Task.Execute()
       --- End of inner exception stack trace ---
    ---> (Inner Exception #0) System.ArgumentException: The path is not of a legal form.
       at System.IO.Path.NewNormalizePathLimitedChecks(String path, Int32 maxPathLength, Boolean expandShortPaths)
       at System.IO.Path.NormalizePath(String path, Boolean fullCheck, Int32 maxPathLength, Boolean expandShortPaths)
       at System.IO.Path.InternalGetDirectoryName(String path)
       at Microsoft.PowerShell.EditorServices.ScriptFile.ParseFileContents()
       at Microsoft.PowerShell.EditorServices.Workspace.GetFileBuffer(String filePath, String initialBuffer)
       at Microsoft.PowerShell.EditorServices.Protocol.Server.LanguageServer.HandleDidOpenTextDocumentNotification(DidOpenTextDocumentParams openParams, EventContext eventContext)
       at Microsoft.PowerShell.EditorServices.Protocol.MessageProtocol.MessageDispatcher.<>c__DisplayClass6_0`2.<SetEventHandler>b__0(Message eventMessage, MessageWriter messageWriter)
       at Microsoft.PowerShell.EditorServices.Protocol.MessageProtocol.MessageDispatcher.<DispatchMessage>d__7.MoveNext()
    --- End of stack trace from previous location where exception was thrown ---
       at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
       at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
       at Microsoft.PowerShell.EditorServices.Protocol.MessageProtocol.ProtocolEndpoint.<ListenForMessages>d__36.MoveNext()
    --- End of stack trace from previous location where exception was thrown ---
       at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
       at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
       at Microsoft.PowerShell.EditorServices.Utility.AsyncContext.Start(Func`1 asyncMainFunc, ILogger logger)
       at System.Threading.Tasks.Task.Execute()<---

The problem occurs here.

That was added to find dot-sourced references, but prevents untitled files from working it seems.