bug#70074: 29.1; js-ts-mode doesn't define comment-line-break-function

[Eli Zaretskii <eliz@gnu.org>]

> From: Evan Davis <davis.evan.m@gmail.com>
> Date: Fri, 29 Mar 2024 11:03:10 -0400
> 
> js-ts-mode and js-mode behave differently when calling default-indent-new-line (M-j) within a multiline
> comment.
> 
> Observed behavior: 
>   - in js-mode, M-j calls c-indent-new-comment-line, which correctly inserts a newline, indented to the correct
> column and prefixed with '*'
>   - in js-ts-mode, M-j calls comment-indent-new-line, which inserts an indented newline without the prefix.
> 
> Expected behavior:
> Block comments should be handled the same in both modes.
> 
> Steps to reproduce:
> 1. emacs -Q
> 2. open a scratch buffer in js-ts-mode and enter text (without quotes) "/*"
> 3. press M-j
> 4. observe newline is created without star prefix
> 
> Follow the same steps in js-mode to observe the desired behavior.

Dmitry, Yuan: any comments or suggestions?