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Support All Native Code Folding Commands

See original GitHub issue

Visual Studio Code offers several useful code folding commands that currently do nothing when editing PowerShell files: Fold All Regions, Unfold All Regions, Fold All Block Comments, and Unfold All Block Comments. I request you add support support for these commands.

Both would be quite useful to me. Being able to easily fold just #region sections would prevent overfolding when dealing with #regions nested in try/catch/finally, if, or switch blocks alongside code not contained in a #region. Similarly, being able to fold just block comments would greatly ease editing files that contain numerous functions with long and detailed comment-based-help sections (I have some scripts that contain several advanced functions, each with multi-page comment-based-help blocks).

You can replicate this issue via the following:

Add the example PowerShell function below to a document in VS Code.
Open the Command Palette
Attempt to run the Fold All Regions or Fold All Block Comments commands.
Observe that no folding occurred.

<#
.SYNOPSIS
    Short description
.DESCRIPTION
    Long description
.PARAMETER a
    Parameter description
.PARAMETER b
    Parameter description
.EXAMPLE
    An example
.NOTES
    General notes
#>
function test-function ($a, $b) {
    #region handle a
        if($a -lt $b) {$a++}
    #endregion handle a

    #region handle b
        if($b -gt 10) {$b--}
    #endregion handle b

    return $a+$b
}