Fix $__ in PS7 with PSReadLine/ replacing it with Get-History call.

FixDolarUnderscoreUnderscore.ps1

Set-PSReadlineKeyHandler -Chord Spacebar -ScriptBlock {
    param ($key, $arg)
    $line = $null
    $cursor = $null
    [Microsoft.PowerShell.PSConsoleReadLine]::GetBufferState(
        [ref]$line, [ref]$cursor
    )

    if ($cursor -lt 3) {
        return
    }

    $replacement = '(Get-History)[-1].Output'

    if ($line.Substring(($cursor - 3),3) -eq '$__') {
        [Microsoft.PowerShell.PSConsoleReadLine]::Replace(
            ($cursor - 3),
            3,
            $replacement
        )
        [Microsoft.PowerShell.PSConsoleReadLine]::SetCursorPosition(($cursor - 3 + $replacement.Length))
    } else {
        [Microsoft.PowerShell.PSConsoleReadLine]::Insert(' ')
    }
}