Fix bizarre box-leakage bug.

diff --git a/syntax.dtx b/syntax.dtx
index 2625c58..1226067 100644 (file)
--- a/syntax.dtx
+++ b/syntax.dtx
@@ -4,14 +4,14 @@
 %
 % Syntax typesetting package for LaTeX 2e
 %
-% (c) 1996 Mark Wooding
+% (c) 2003 Mark Wooding
 %
 % \end{meta-comment}
 %
 % \begin{meta-comment} <general public licence>
 %%
 %% syntax package -- typesetting syntax descriptions
-%% Copyright (c) 1996 Mark Wooding
+%% Copyright (c) 2003 Mark Wooding
 %%
 %% This program is free software; you can redistribute it and/or modify
 %% it under the terms of the GNU General Public License as published by
@@ -32,7 +32,7 @@
 % \begin{meta-comment} <Package preamble>
 %<+package>\NeedsTeXFormat{LaTeX2e}
 %<+package>\ProvidesPackage{syntax}
-%<+package>                [1996/05/17 1.07 Syntax typesetting (MDW)]
+%<+package>                [2003/08/25 1.08 Syntax typesetting (MDW)]
 % \end{meta-comment}
 %
 % \CheckSum{1616}
@@ -637,66 +637,6 @@
 % commands, in \env{grammar} environments, and in syntax diagrams.
 %
 %
-% \section{Change history}
-%
-% \subsection*{Version 1.07}
-%
-% \begin{itemize}
-% \item Fixed problem with underscore hacking in a \env{tabbing} environment.
-% \end{itemize}
-%
-% \subsection*{Version 1.06}
-%
-% \begin{itemize}
-% \item Added style hooks for syntax items.
-% \item Improved colour handling in syntax diagrams, thanks to the |\doafter|
-%       package.
-% \item Fixed some nasty bugs in the \env{grammar} environment which confused
-%       other lists and ruined the spacing.  The \env{grammar} handling is
-%       now much tidier in general.
-% \end{itemize}
-%
-% \subsection*{Version 1.05}
-%
-% \begin{itemize}
-% \item Fixed `the bug' in the syntax diagram typesetting.  It now breaks
-%       lines almost psychically, and doesn't break in the wrong places.
-% \item Almost rewrote the \env{grammar} environment.  It now does lots of
-%       the list handling itself, to allow more versatile typesetting of the
-%       left hand sides.  There's lots of evil in there now.
-% \item Added some more configurability.  In particular, two new settings
-%       have been added to control \env{grammar} environments, and a neat
-%       way of adding new syntax diagram structures has been introduced.
-% \end{itemize}
-%
-% \subsection*{Version 1.04}
-%
-% \begin{itemize}
-% \item Changed the vertical positioning of the rules, to make all the text
-%       line up properly.  While the old version was elegant and simple, it
-%       had the drawback of looking nasty.
-% \item Allow line breaks at underscores, but don't if there's another one
-%       afterwards.  Also, prevent losing following space if underscore is
-%       written to a file.
-% \end{itemize}
-%
-% \subsection*{Version 1.02}
-%
-% \begin{itemize}
-% \item Added support for rounded corners in syntax diagrams.
-% \item Changed lots of |\hskip| commands to |\kern|s, to prevent possible
-%       line breaks.
-% \end{itemize}
-%
-% \subsection*{Version 1.01}
-%
-% \begin{itemize}
-% \item Allowed disabling of underscore active character, to avoid messing
-%       up filenames.
-% \item Added |\grammarparsep| and |\grammarindent| length parameters to
-%       control the appearance of grammars.
-% \end{itemize}
-%
 % \implementation
 %
 % \section{Implementation of \syn}
@@ -1728,7 +1668,7 @@
 }
 \def\sd@leftarr{%
   \bgroup%
-  \raise\sd@mid\hbox{\@linefnt\char'33\kern-6\p@}%
+  \setbox\tw@\hbox{\@linefnt\char'33\kern-6\p@}%
   \sd@arrow%
 }
 %    \end{macrocode}