[hlx] Translation of tabbing environments

[Chris G. <cw...@ii...>]

There seems to be a bug in the rendering of some browsers, at least 
Galeon and Mozilla in Linux, in that if a table line starts with a 
unicode character &#nnn; the line is displayed as the intended character 
followed by a dirty smudge.  You can remove the smudge by dragging the 
mouse over it, miraculously displaying what was intended!

I have also tried Internet Explorer and Netscape in Windows, which are 
OK, and Opera in Linux, which is OK.

If you precede the unicode character with a no-break space (&#nbsp;) the 
rendering is OK.  So I have made a fix that does this to every line in a 
table generated from hyperlatex from a tabbing environment: every line, 
not just the affected ones, to keep the relative indentation.  The whole 
table appears to be shifted one space to the right, but that seems a 
small price to pay.

The fix is to the last few lines of hyperlatex-final-substitutions, 
which become

     ;; finally, convert the magic chars to their real counterpart
     (goto-char (point-min))
     (while (re-search-forward hyperlatex-meta-all nil t)
       (replace-match
        (char-to-string (- (preceding-char) hyperlatex-meta-offset)) t))
     ;; lines in tables that start with &#nnn; are not displayed
     ;; properly in some browsers, including Mozilla in Linux.
     ;; To fix this, insert   in front of all lines
     ;; This also has the advantage of preserving empty lines in
     ;; tabbing environments.
     ;; CWG 6/4/04
     (goto-char (point-min))
     (while (search-forward "colspan=\"99\" align=\"left\">" nil t)
       (replace-match "colspan=\"99\" align=\"left\"> " t t))
     ;; make labels
     (goto-char (point-min))
     (while (search-forward hyperlatex-meta-X nil t)
       (replace-match "")
       (if (looking-at "[ \t\n]*[^<> \t\n]+\\([ \t\n]\\)")
	  (goto-char (match-beginning 1))
	(insert "&nbsp;"))
       (insert "</a>"))
     ;; put back protected characters
     (goto-char (point-min))
     (while (re-search-forward meta-iso-regexp nil t)
       (replace-match (char-to-string
		      (string-to-number
		       (buffer-substring (match-beginning 1)
					 (match-end 1)))) t))))

(Forgive me for not reporting this in the form of a patch, but I have 
many other changes to hyperlatex.el for the way we use hyperlatex.  The 
only change is the insertion of the comment about lines in tables and 
the following 3 lines of lisp.)

As you can see from the comment this also fixes a problem in that empty 
lines in tabbing environments disappear.

Finally, there is also correction of what I think is a typo in the 
original of the above: "/a" was "/A".

Regards,

Chris George