Add completion for loop labels after Break/Continue

[MartinGC94]

PR Summary

Adds completion for loop labels after labeled control flow statements such as Break and Continue.
The completion will look for any loops with a label that surrounds the Break/Continue keywords.
The tooltips for the completion entries shows the relevant loop.

PR Context

Tab completion is always convenient because it helps prevents typos. It also helps prevent a relatively common mistake of including a colon in the label after Break/Continue.

PR Checklist

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• Breaking changes
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  • OR
  • Experimental feature(s) needed
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  • Not Applicable
  • OR
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    • Issue filed:
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• Tooling
  • I have considered the user experience from a tooling perspective and don't believe tooling will be impacted.
  • OR
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    • Impact on PowerShell Editor Services which is used in the PowerShell extension for VSCode
      (which runs in a different PS Host).
      • Issue filed:
    • Impact on Completions (both in the console and in editors) - one of PowerShell's most powerful features.
      • Issue filed:
    • Impact on PSScriptAnalyzer (which provides linting & formatting in the editor extensions).
      • Issue filed:
    • Impact on EditorSyntax (which provides syntax highlighting with in VSCode, GitHub, and many other editors).
      • Issue filed:

[ghost]

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[adityapatwardhan]

Adding @daxian-dbw as area expert.

[iSazonov]

Can follow work (without closing brackets)?
:Outer do {:Inner while ($true){ break } continue ^

[MartinGC94]

Can follow work (without closing brackets)? :Outer do {:Inner while ($true){ break } continue ^

Now it does :)
I doubt most people will notice though. If you are using loop labels you are almost certainly editing in an editor and using snippets to create the loops.

[ghost]

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[pull-request-quantifier-deprecated]

This PR has 68 quantified lines of changes. In general, a change size of upto 200 lines is ideal for the best PR experience!

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Quantification details

Label      : Small
Size       : +68 -0
Percentile : 27.2%

Total files changed: 2

Change summary by file extension:
.cs : +22 -0
.ps1 : +46 -0

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[ghost]

This pull request has been automatically marked as Review Needed because it has been there has not been any activity for 7 days.
Maintainer, please provide feedback and/or mark it as Waiting on Author

[daxian-dbw]

@adityapatwardhan This PR is ready to be merged.

[iSazonov]

@MartinGC94 Thanks for your contribution!

[ghost]

🎉v7.3.0-preview.2 has been released which incorporates this pull request.:tada:

Handy links:

• Release Notes