\fork@array@option<#1>[#2]%
\@mkpream{#3}\edef\@preamble{\ialign \noexpand\@halignto
\bgroup\@arstrut \@preamble \tabskip\z@skip \cr}%
- \let\tabularnewline\\%
+ \let\@startpbox\@@startpbox \let\@endpbox\@@endpbox
+ \let\tabularnewline\\%
\@begin@alignbox\bgroup\box@dir\adjustbaseline
\let\par\@empty
\let\@sharp##\let\protect\relax
{\ltj@ext@dir=\ltjgetparameter{direction}\relax}{}{}
\def\@startpbox##1{\bgroup
\box@dir\adjustbaseline%%% これを追加
- \hsize=##1\@arrayparboxrestore
+ \setlength\hsize{##1}\@arrayparboxrestore
\everypar{%
\vrule \@height \ltjgetht\@arstrutbox \@width \z@
\everypar{}}%