Environment

Windows build number: Microsoft Windows [Version 10.0.18362.175]

Any other software? Visual Studio Code Insiders

Steps to reproduce

1. Launch VS Code Insiders.
2. Ensure using conpty with setting: terminal.integrated.windowsEnableConpty
3. Open a terminal with Ctrl+`
4. Close the terminal with the trash can icon
5. Repeat 3 and 4 until the window hangs. It takes around 10 retries on my machine.

Expected behavior

No hanging.

Actual behavior

The window hangs. Using windbg, I see the following:

Notice the many leftover conhosts in the task manager as well as the hang in ClosePseudoConsole.

Here is the link to the code in node-pty calling into the PseudoConsole API.
https://github.com/microsoft/node-pty/blob/04445ed76f90b4f56a190982ea2d4fcdd22a0ee7/src/win/conpty.cc#L429

/cc @daimms