VSCode Debug mode starts without real debugger.

[jhyunetp]

Environment data

• PTVSD version: ?
• OS and version: Windows 10
• Python version (& distribution if applicable, e.g. Anaconda): 3.8.2
• Using VS Code or Visual Studio: VSCode

Actual behavior

Python Debug Mode doesn't clear terminal before it commands.

Expected behavior

Remove all written string on terminal and Start Debugging mode

XXX

Steps to reproduce:

1. type anything in terminal (I typed 341431 below)
2. Press F5 ( debug )
   C:\Users\Antonio\Documents\인호님 튜터링>341431 cmd /C "set "DEBUGPY_LAUNCHER_PORT=60452" && C:\Users\Antonio\AppData\Local\Programs\Python\Python38\python.exe c:\Users\Antonio\.vscode\extensions\ms-python.python-2020.4.76186\pythonFiles\lib\python\debugpy\no_wheels\debugpy\launcher "c:\Users\Antonio\Documents\인호님 튜터링\a.py" " '341431' is not recognized as an internal or external command, operable program or batch file.
   
3. terminal is now cleared
4. Press Shift + F5 ( debug ) again
   -> Nothing happens - There is already a debug configuration "Python: Current File" running.
5. I have to Press F5 over and over again until Debugger time out happens.

[int19h]

This can happen if you had something typed at the command prompt in the terminal before you start debugging. It's a fundamental VSCode limitation: when the debugger asks it to run your program, it simulates text input in the shell - but it has no way of knowing whether the shell prompt is in a valid state or not; and if not, it doesn't know what it needs to do to clear it.

You're welcome to file it as a feature request in the vscode repo, but I'm not sure what they can do about it without a cooperative shell.