PR Summary

If a script uses tabs instead of spaces, the calculation for the caret for error position is wrong. This is because the InvocationInfo member treats tabs as a single character. However, the pre-rendered PositionMessage member already takes care of the tabs and the correct index so the change is to rely on parsing that to get the information rather than the existing members.

Before and after shot:

PR Context

Fix #11394
Fix #10760

PR Checklist

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• Make sure all .h, .cpp, .cs, .ps1 and .psm1 files have the correct copyright header
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  • Experimental feature(s) needed
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• Testing - New and feature
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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).
    • Impact on Completions (both in the console and in editors) - one of PowerShell's most powerful features.
    • Impact on PSScriptAnalyzer (which provides linting & formatting in the editor extensions).
    • Impact on EditorSyntax (which provides syntax highlighting with in VSCode, GitHub, and many other editors).