PSException when using an emoji as string in command line

[srirajshukla]

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: 2.1.0
PowerShell: 7.2.11
OS: Microsoft Windows 10.0.19045
BufferWidth: 140
BufferHeight: 20

Last 200 Keys

 h e c k o u t Spacebar m e m Backspace l l o w Enter u g i t Spacebar k Enter u g i t Spacebar c o m m RightArrow Enter u g i t Spacebar k 
Enter u g i t Spacebar s t a t u s Enter u g i t Spacebar b r a n c h Spacebar b 2 Enter u g i t Spacebar k Enter u g i t Spacebar c h e c k o u t Spacebar b 2 Enter u g i t Spacebar Backspace Backspace Backspace Backspace Backspace Backspace Backspace Backspace Backspace " i n Spacebar b r a n c h Spacebar b 2 " > Spacebar i n f o 2 2 . t x t Enter u g i t Spacebar o c m m Backspace Backspace Backspace Backspace c o m m i t Spacebar RightArrow LeftArrow Backspace Backspace Backspace Backspace Backspace Backspace Backspace Backspace Backspace Backspace Backspace l o v e l y Enter UpArrow RightArrow RightArrow RightArrow RightArrow RightArrow RightArrow RightArrow RightArrow RightArrow RightArrow RightArrow RightArrow RightArrow RightArrow RightArrow RightArrow RightArrow RightArrow RightArrow RightArrow RightArrow RightArrow � RightArrow Enter

Exception

System.Text.EncoderFallbackException: Unable to translate Unicode character \\uD83D at index 22 to specified code page.
   at System.Text.EncoderExceptionFallbackBuffer.Fallback(Char charUnknown, Int32 index)
   at System.Text.EncoderFallbackBuffer.InternalFallback(ReadOnlySpan`1 chars, Int32& charsConsumed)
   at System.Text.Encoding.GetBytesWithFallback(ReadOnlySpan`1 chars, Int32 originalCharsLength, Span`1 bytes, Int32 originalBytesLength, EncoderNLS encoder)
   at System.Text.Encoding.GetBytesWithFallback(Char* pOriginalChars, Int32 originalCharCount, Byte* pOriginalBytes, Int32 originalByteCount, Int32 charsConsumedSoFar, Int32 bytesWrittenSoFar, EncoderNLS encoder)
   at System.Text.Encoding.GetBytes(Char* pChars, Int32 charCount, Byte* pBytes, Int32 byteCount, EncoderNLS encoder)
   at System.IO.StreamWriter.Flush(Boolean flushStream, Boolean flushEncoder)
   at System.IO.StreamWriter.Dispose(Boolean disposing)
   at System.IO.TextWriter.Dispose()
   at Microsoft.PowerShell.PSConsoleReadLine.<>c__DisplayClass83_0.<WriteHistoryRange>b__0()
   at Microsoft.PowerShell.PSConsoleReadLine.WithHistoryFileMutexDo(Int32 timeout, Action action)
   at Microsoft.PowerShell.PSConsoleReadLine.WriteHistoryRange(Int32 start, Int32 end, Boolean overwritten)
   at Microsoft.PowerShell.PSConsoleReadLine.MaybeAddToHistory(String result, List`1 edits, Int32 undoEditIndex, Boolean fromDifferentSession, Boolean fromInitialRead)
   at Microsoft.PowerShell.PSConsoleReadLine.InputLoop()
   at Microsoft.PowerShell.PSConsoleReadLine.ReadLine(Runspace runspace, EngineIntrinsics engineIntrinsics, CancellationToken cancellationToken)

### Screenshot

N/A

### Environment data

```console
PS Version: 7.2.11
PS HostName: ConsoleHost
PSReadLine Version: 2.1.0
PSReadLine EditMode: Windows
OS: 10.0.19041.1 (WinBuild.160101.0800)
BufferWidth: 113
BufferHeight: 20

Steps to reproduce

"😊"

Expected behavior

The emoji should be printed.

Actual behavior

The above exception occurs

[StevenBucher98]

Can you provide better reproduction steps? I can copy that emoji into my terminal just fine in the latest PSReadLine version. Can you upgrade to 2.2.6 and see if it still is happening?

[ListsOfArrays]

It's happening for me in 2.2.6 in the VS Code window.
When using the terminal page in VS Code, and using the Windows Emoji keyboard to insert an emoji (such as 🏆), the above exception occurs.

$test=[char]'🏆'

I cannot repro this on Windows Terminal though. Notably the emoji does not even show up correctly in VS Code.

[StevenBucher98]

@ListsOfArrays are you using the PowerShell VSCode extension? I was able to use both pwsh terminal and PowerShell Extension terminal to print an emoji in a string.

Also the code you provided seems to fail for me with the following
InvalidArgument: Cannot convert value "🏆" to type "System.Char". Error: "String must be exactly one character long."

I am not entirely sure what is underlying technology for emojis and ASCII char so this could be expected? cc @daxian-dbw in case he may know.

Also cc @andschwa for VSCode extension visibility.

[daxian-dbw]

This is a duplicate of #2358