ALT+H causes exception with parameter help message

[ThomasNieto]

Prerequisites

• Write a descriptive title.
• Make sure you are able to repro it on the latest released version
• Search the existing issues, especially the pinned issues.

Exception report

### Environment
PSReadLine: 2.2.6
PowerShell: 7.2.5
OS: Microsoft Windows 10.0.19043
BufferWidth: 120
BufferHeight: 30

Last 200 Keys:

 Enter
 Spacebar Spacebar Spacebar Spacebar } Enter
 Spacebar Spacebar Spacebar Spacebar Enter
 Spacebar Spacebar Spacebar Spacebar e n d Spacebar { Enter
 Spacebar Spacebar Spacebar Spacebar Spacebar Spacebar Spacebar Spacebar Enter
 Spacebar Spacebar Spacebar Spacebar } Enter
 } Enter
 Enter
 t e s t - m Tab Enter
 UpArrow Spacebar - n Tab Spacebar Backspace Enter
 UpArrow Backspace Backspace Backspace Backspace Backspace - ? Enter
 UpArrow Backspace Backspace Backspace Home g e t - h e l p Spacebar Enter
 UpArrow Spacebar - f u Tab l l Enter
 UpArrow Backspace Backspace Enter
 UpArrow Backspace Backspace Backspace Backspace Backspace Ctrl+Backspace Ctrl+Backspace Ctrl+Backspace Ctrl+Backspace t e s t - m a n Tab Spacebar - n Tab Spacebar Backspace F1 Alt+h Enter
 Enter
 g e t - h e l Backspace Backspace Backspace p s r e s Backspace Tab Tab Shift+Tab Enter
 t e s w t - Backspace Backspace Backspace Backspace Backspace Backspace Backspace g e t - c o m Tab Spacebar - m o Tab Spacebar Backspace Alt+h Alt+h Ctrl+Backspace Ctrl+Backspace c o m Backspace Backspace Backspace Backspace Backspace Backspace Backspace t e s t - m a n Tab Spacebar - n Tab Spacebar Backspace Alt+h

### Exception

Microsoft.CSharp.RuntimeBinder.RuntimeBinderException: 'char' does not contain a definition for 'Text'
   at CallSite.Target(Closure , CallSite , Object )
   at System.Dynamic.UpdateDelegates.UpdateAndExecute1[T0,TRet](CallSite site, T0 arg0)
   at CallSite.Target(Closure , CallSite , Object )
   at Microsoft.PowerShell.PSConsoleReadLine.WriteParameterHelp(Object helpContent)
   at Microsoft.PowerShell.PSConsoleReadLine.WriteDynamicHelpContent(String commandName, String parameterName, Boolean isFullHelp)
   at Microsoft.PowerShell.PSConsoleReadLine.DynamicHelpImpl(Boolean isFullHelp)
   at Microsoft.PowerShell.PSConsoleReadLine.ShowParameterHelp(Nullable`1 key, Object arg)
   at Microsoft.PowerShell.PSConsoleReadLine.ProcessOneKey(PSKeyInfo key, Dictionary`2 dispatchTable, Boolean ignoreIfNoAction, Object arg)
   at Microsoft.PowerShell.PSConsoleReadLine.InputLoop()
   at Microsoft.PowerShell.PSConsoleReadLine.ReadLine(Runspace runspace, EngineIntrinsics engineIntrinsics, CancellationToken cancellationToken, Nullable`1 lastRunStatus)

Screenshot

Environment data

PS Version: 7.2.5
PS HostName: ConsoleHost (Windows Terminal)
PSReadLine Version: 2.2.6
PSReadLine EditMode: Windows
OS: 10.0.19041.1 (WinBuild.160101.0800)
BufferWidth: 120
BufferHeight: 30

Steps to reproduce

Define this function and then press ALT + H to show parameter help and then it will error.

function test-mandatory {
    [CmdletBinding()]
    param (
        [Parameter(HelpMessage = 'this is a test')]
        [string]
        $Name
    )
    
    begin {
        
    }
    
    process {
        $Name
    }
    
    end {
        
    }
}

test-mandatory -Name

Expected behavior

Shows parameter help message

Actual behavior

The above exception happens.

[daxian-dbw]

Close by #3370

🎉 This issue was addressed in 3370, which has now been successfully released in v2.3.0-beta0. 🎉