[Bug 276250] Backspace issue related to PS1 special variable containing \n formatting sequence

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=276250

            Bug ID: 276250
           Summary: Backspace issue related to PS1 special variable
                    containing \n formatting sequence
           Product: Base System
           Version: 14.0-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: bin
          Assignee: bugs@FreeBSD.org
          Reporter: white-pack@pm.me

The non-printing character \n in a formatting sequence for PS1 only works as
expected at the beginning of a formatting sequence. If placed anywhere else,
then the backspace key behaves erratically.

For instance:

1) The following sequence works as expected with no backspace issues:
export PS1="\[\n\]\h:\w \$ "

2) The following one reveals an issue with the backspace behavior:
export PS1="\[\n\]\h:\w \[\n\]\$ "

This has been observed at the console level.
No X-Windows is running, thus no graphical terminals are involved.

$ echo $TERM​
xterm-256color​
​
$ stty​
speed 9600 baud;​
lflags: echoe echoke echoctl​
iflags: -iutf8
oflags: tab0​
cflags: cs8 -parenb​

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