vscode seems don't handle newline and tab correctly in snippet string provided by inlineCompletionProvider

[perfecking]

Does this issue occur when all extensions are disabled?: Yes

• VS Code Version: 1.82.2 (Universal)

• OS Version: MacOS 12.1

Steps to Reproduce: inline_completion.zip inline_badcase.zip https://github.com/microsoft/vscode/assets/4253318/deee8444-00b0-4b20-8ed9-603ee44e98b0

1. Unzip the inline_inline_badcase.zip file, which contains the problematic case file.
2. Unzip the inline_completion.zip file and build the test extension. Then, run the extension and open the above-mentioned case file as the workspace. (npm install && npm run vscode:prepublish , then run it)
3. Go to line 5 in the editor and type something before the word 'else:' end. You will notice that some ghost inline completion text is generated, and its format is correct. However, after pressing the tab key to accept it, the file becomes corrupted, with additional tabs inserted at the beginning of each line.

I have also attached a GIF to demonstrate this issue. Thank you for any assistance in resolving this problem.

[hediet]

It would be awesome if you could reproduce your issue in the monaco editor playground.

As we have to be very careful when opening/running external source code from zip files, a playground example would significantly speed up the process.

[perfecking]

It would be awesome if you could reproduce your issue in the monaco editor playground.

As we have to be very careful when opening/running external source code from zip files, a playground example would significantly speed up the process.

I'm glad to receive your reply so fast. As you mentioned, I successfully reproduce the issue in the Monaco Editor playground. I have attached a GIF to demonstrate this issue. Thank you.

ps: I have attached related source code, and append '.txt' suffix so that i can upload. extension.ts.txt def_hello.py.txt