PR Summary

When doing module name completion such asGet-Module mic<tab> orGet-Module psr<tab>, you will seeMicrosoft.PowerShell.PSReadLine2 as the result of completion.Microsoft.PowerShell.PSReadLine2 is a nested module ofPSReadLine, which shouldn't be returned by completion. It's returned because the completion happens in PSReadLine's context (using PSReadLine'sSessionState as theEngineSessionState) and hence its nested modules are visible to the tab completion.

This PR filters out the nested modules ofPSReadLine from the tab completion results. It's intentional to not hard code the name 'PSReadLine' in the change, so that in case the tab completion is triggered from within a different module, its nested modules can also be filtered out.

PR Checklist

• PR has a meaningful title
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• Summarized changes
• Make sure all.h,.cpp,.cs,.ps1 and.psm1 files have the correct copyright header
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  • Documentation needed
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