outline cannot get the command line of the custom PS1 correctly

After I entered a command on my customized PS1, the outline did not capture the command I entered.
```sh
$ echo $PS1
\[\e]0;\w\a\]\n\[\e[32m\]\u@\h \[\e[33m\]\w\[\e[0m\]\n\$
```

Reproduce the command-capture failure in WindTerm using the customized PS1 shown in the issue, then trace the terminal's prompt and command-line handling entry points. Compare capture behavior with a simpler PS1 and confirm that commands entered after the provided prompt are recorded correctly before considering the issue done.

Written by the indexing model from the issue text.