Command Explorer lists multiple commands with the same name

System Details

System Details Output

### VSCode version: 1.31.0-insider 28e7467661d67c05c3662ff900ee1984f7e2fbcc x64
(node:27697) [DEP0005] DeprecationWarning: Buffer() is deprecated due to security and usability issues. Please use the Buffer.alloc(), Buffer.allocUnsafe(), or Buffer.from() methods instead.

### VSCode extensions:
DavidAnson.vscode-markdownlint@0.23.0
EditorConfig.EditorConfig@0.12.6
eg2.tslint@1.0.42
ms-vscode.csharp@1.17.1
ms-vscode.PowerShell@1.10.2
msjsdiag.debugger-for-chrome@4.11.1


### PSES version: 1.10.2.0

### PowerShell version:

Name                           Value
----                           -----
PSVersion                      6.1.1
PSEdition                      Core
GitCommitId                    6.1.1
OS                             Linux 4.9.0-8-amd64 #1 SMP Debian 4.9.130-2 (2018-10-27)
Platform                       Unix
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0...}
PSRemotingProtocolVersion      2.3
SerializationVersion           1.1.0.1
WSManStackVersion              3.0

Issue Description

While working on an enhancement to the Command Explorer, I noticed a number of command names showed up twice. I also noted that they didn't duplicate in pwsh at the terminal. It appears they are being duplicated when you have multiple versions of the same module (in my case I have versions 1.6.7 and 2.0.3 of PowerShellGet installed).

I ran the command Microsoft.PowerShell.Core\Get-Command -CommandType @("Function","Cmdlet","ExternalScript") | Microsoft.PowerShell.Utility\Select-Object -Property @("Name","ModuleName") | Microsoft.PowerShell.Utility\Sort-Object -Property Name and I don't see the double commands.

Expected Behaviour

When refreshing the Command Explorer, should return a single instance of each command.

Actual Behaviour

Getting duplicate commands:

Attached Logs

logs.zip

Command Explorer の更新エントリポイントから開始し、複数のバージョンの PowerShellGet がインストールされている状態で問題を再現します。返されたコマンドを、提供されている Get-Command パイプラインと比較します。更新時にエクスプローラーに各コマンド名のインスタンスが 1 つだけ表示されれば完了です。