\ltj@@orig@moveleft\the\ltj@tempdima\noexpand\box\ltj@afbox
}\ltj@afterbox\ltj@@moveleft@a}
+%%%%\vsplit
+\let\ltj@@orig@vsplit=\vsplit
+\protected\def\vsplit{\directlua{luatexja.direction.vsplit()}}
%%%% \vcenter
\let\ltj@@orig@vcenter=\vcenter
\protected\def\vcenter{\ltj@afterbox\ltj@@vcenter\vbox}