Extra c0c Inserted At Beginning of File in Windows Docker Container

[grochoge]

Running 1.1 in Windows docker container mcr.microsoft.com/windows/nanoserver:ltsc2022 through docker run --rm -it in Windows Terminal 1.22.11141.0

Using Docker 27.4.1 (the latest version that works properly in Windows :-/)

Launching edit with or without a file will insert "c0c" at the beginning of the document.

Example:
echo Hello world! > hello.txt
edit hello.txt
Ctrl+Q

Note this doesn't happen when run through cmd.exe

[elsaco]

Without opening a new bug, using ssh to windows containers I noticed alike behavior.

Setup is:

• Windows Server 2025
• OpenSSH_for_Windows_9.5p1
• Docker version 28.1.1, build 4eba377
• Server Core container ( mcr.microsoft.com/windows/servercore:ltsc2022)
• Windows 10 client with Terminal ver. 1.22.11141.0
• Edit 1.1

From client ssh to server, start container + powershell, then run edit:

Enter more lines:

Delete lines 2 & 3:

Ctrl+W and move focus to Don't Save:

[lhecker]

I'm going to close this issue in favor of #243 so we can focus the discussion in a single place. Whether it's a docker container or SSH, the effect of the issue appears to be the same, so it's highly likely the same thing.