[7.2.0-preview.6] - 2021-05-27

* Experimental Features

- [Breaking Change] Update prediction interface to provide additional feedback to a predictor plugin (#15421)

* Performance

- Avoid collecting logs in buffer if a pipeline execution event is not going to be logged (#15350)
- Avoid allocation in `LanguagePrimitives.UpdateTypeConvertFromTypeTable` (#15168) (Thanks @xtqqczze!)
- Replace `Directory.GetDirectories` with `Directory.EnumerateDirectories` to avoid array allocations (#15167) (Thanks @xtqqczze!)
- Use `List.ConvertAll` instead of `LINQ` (#15140) (Thanks @xtqqczze!)

* General Cmdlet Updates and Fixes

- Use `AllocConsole` before initializing CLR to ensure codepage is correct for WinRM remoting (PowerShell/PowerShell-Native#70) (Thanks @jborean93!)
- Add completions for `#requires` statements (#14596) (Thanks @MartinGC94!)
- Add completions for comment-based help keywords (#15337) (Thanks @MartinGC94!)
- Move cross platform DSC code to a PowerShell engine subsystem (#15127)
- Fix `Minimal` progress view to handle activity that is longer than console width (#15264)
- Handle exception if ConsoleHost tries to set cursor out of bounds because screen buffer changed (#15380)
- Fix `NullReferenceException` in DSC `ClearCache()` (#15373)
- Update `ControlSequenceLength` to handle colon as a virtual terminal parameter separator (#14942)
- Update the summary comment for `StopTranscriptCmdlet.cs` (#15349) (Thanks @dbaileyut!)
- Remove the unusable alias `d` for the `-Directory` parameter from `Get-ChildItem` (#15171) (Thanks @kvprasoon!)
- Fix tab completion for un-localized `about` topics (#15265) (Thanks @MartinGC94!)
- Remove the unneeded SSH stdio handle workaround (#15308)
- Add `LoadAssemblyFromNativeMemory` API to load assemblies from memory in a native PowerShell host (#14652) (Thanks @awakecoding!)
- Re-implement `Remove-Item` OneDrive support (#15260) (Thanks @iSazonov!)
- Kill native processes in pipeline when pipeline is disposed on Unix (#15287)
- Default to MTA on Windows platforms where STA is not supported (#15106)

* Code Cleanup

<details>

<summary>

<p>We thank the following contributors!</p>
<p>@xtqqczze, @powercode, @bcwood</p>

</summary>

<ul>
<li>Enable <code>nullable</code> in some classes (#14185, #14177, #14159, #14191, #14162, #14150, #14156, #14161, #14155, #14163, #14181, #14157, #14151) (Thanks @powercode!)</li>
<li>Annotate <code>ThrowTerminatingError</code> with <code>DoesNotReturn</code> attribute (#15352) (Thanks @powercode!)</li>
<li>Use <code>GetValueOrDefault()</code> for nullable <code>PSLanguageMode</code> (#13849) (Thanks @bcwood!)</li>
<li>Enable <code>SA1008</code>: Opening parenthesis should be spaced correctly (#14242) (Thanks @xtqqczze!)</li>
</ul>

</details>

* Tools

- Add `winget` release script (#15050)

* Tests

- Enable cross-runtime benchmarking to compare different .NET runtimes (#15387) (Thanks @adamsitnik!)
- Add the performance benchmark project for PowerShell performance testing (#15242)

* Build and Packaging Improvements

<details>

<summary>
Update .NET to version <code>v6.0.0-preview.4</code>
</summary>

<ul>
<li>Suppress prompting when uploading the <code>msixbundle</code> package to blob (#15227)</li>
<li>Update to .NET preview 4 SDK (#15452)</li>
<li>Update <code>AppxManifest.xml</code> with newer OS version to allow PowerShell installed from Windows Store to make system-level changes (#15375)</li>
<li>Ensure the build works when <code>PSDesiredStateConfiguration</code> module is pulled in from PSGallery (#15355)</li>
<li>Make sure daily release tag does not change when retrying failures (#15286)</li>
<li>Improve messages and behavior when there's a problem in finding zip files (#15284)</li>
</ul>

</details>

* Documentation and Help Content

- Add documentation comments section to coding guidelines (#14316) (Thanks @xtqqczze!)

[7.2.0-preview.6]: https://github.com/PowerShell/PowerShell/compare/v7.2.0-preview.5...v7.2.0-preview.6