M-j (default-indent-new-line) on a comment line/block about ahk-mode

[duianto]

I don't know what's causing the issue, but this might be helpful.

Starting with:

;

The cursor is after the semicolon.

Pressing: M-j calls: (default-indent-new-line)
which calls the function in the variable: comment-line-break-function

In a ahk-mode buffer the function is: comment-indent-new-line
https://github.com/emacs-mirror/emacs/blob/8558ecd65fc1c87345353f6352299df04280e729/lisp/newcomment.el#L1434

It calls: (comment-indent continuep)
https://github.com/emacs-mirror/emacs/blob/8558ecd65fc1c87345353f6352299df04280e729/lisp/newcomment.el#L1541

The comment-indent function:
https://github.com/emacs-mirror/emacs/blob/8558ecd65fc1c87345353f6352299df04280e729/lisp/newcomment.el#L716

Inserts /**/ on the second line, which results in:

;
/**/

Then back at the end of the function: comment-indent-new-line
https://github.com/emacs-mirror/emacs/blob/8558ecd65fc1c87345353f6352299df04280e729/lisp/newcomment.el#L1542

It removes the last two characters on the second line,
and adds them at the end of the first line.

;*/
/*