Patch: Syntax and Hard Newlines

["Herbert Euler" <herberteuler@hotmail.com>]

Emacs provides a hard newline mode.  If you type M-x use-hard-newlines
RET, you turn on the hard newline mode.  In this mode, all newlines in
a buffer are re-scanned and marked as either a ``hard'' one or a
``soft'' one.  The behavior of commands inserting a newline character
is also altered: `newline' and `open-line' will add the text property
`hard' (value set to t) to newlines that they insert.

As documented in the doc string of the command `use-hard-newlines',
newlines not marked hard are internal to paragraphs.  However,
currently the syntax feature does not work well with this.  For
example, if you turn on long-lines mode with M-x longlines-mode RET in
the *scratch* buffer, you will see the word `evaluation' in the first
line is wrapped into the second line, but not recognized as a part of
the comment.

To fix this, we can let the function `forw_comment' in syntax.c skip
the soft newlines when possible.  Below is the patch.

Regards,
Guanpeng Xu

Index: syntax.c
===================================================================
RCS file: /sources/emacs/emacs/src/syntax.c,v
retrieving revision 1.166.4.20
diff -r1.166.4.20 syntax.c
2126a2127
>   register int skip_soft_newlines;
2129a2131,2137
>   /* If `use-hard-newlines' is t, only newlines with the `hard'
>      property set to t are real newlines.  Other newlines are soft and
>      should be skipped. */
>   skip_soft_newlines = !NILP (Fsymbol_value
>                               (intern
>                                ("use-hard-newlines")));
>
2145a2154,2163
>       if (skip_soft_newlines
>           && c == '\n'
>           && NILP (Fget_text_property (make_number (from_byte),
>                                        intern ("hard"),
>                                        Qnil)))
>         {
>           INC_BOTH (from, from_byte);
>           UPDATE_SYNTAX_TABLE_FORWARD (from);
>           continue;
>         }

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