Color Error in Docker on WSL2

[MrJia1997]

Windows Terminal version

1.18.2822.0

Windows build number

10.0.19045.0

Other Software

Docker Desktop 4.24.1
Zsh 5.9
Python 3.11

Steps to reproduce

Using docker exec -it <container> /usr/local/bin/zsh to attach to the running container.
Using python rich module to test color.

Expected Behavior

Color palette should be full and smooth.

Actual Behavior

[zadjii-msft]

This looks exactly like what I'd expect if docker was using ReadConsoleOutput to read the attributes of the text buffer manually, instead of using ConPTY to get the raw escape sequences. When an app does that, we've got to "round" the color to the nearest color table entry. I could have swore that we worked with the CExecSvc / dockerd folks to move over to conpty though... maybe they're using ConPTY in xterm mode instead of xterm-256color.

The last email I have on the subject was from 2018 with @jstarks - maybe he's got a better idea than me?

[carlos-zamora]

Docker for WSL2 does not use conpty. We should repro this and investigate this further.