Hi.  I'd like to resurrect this bug.

While working in JS I found a bug, which I tracked down to the same
change indicated here.  Basically, auto-fill in JS mode will sometimes
insert a "/*" on a filled line, where it should not.

You can see a precise recipe in the new test case, in the attached
patch.

One funny thing is that if you do this interactively (in my real-world
case I had auto-fill-mode enabled), you have to be sure that there isn't
a newline after point.  If there is a newline, the filling works
properly.

Anyway, let me know what you think.  I'd like to check this in, but,
given the comments in https://debbugs.gnu.org/cgi/bugreport.cgi?bug=6806#23
I suppose I would not close the bug.

Tom