Dear list,
The function node.rangedimensions(), when applied to vertical lists,
includes contributions of (vertical) glue nodes in the (horizontal)
width. A simple example:
-------------------------------------------------------------
\setbox0 = \vbox{
\vskip 10sp
\hrule width 1sp height 2sp depth 3sp }
\directlua{
texio.write_nl (string.format(
'\csstring\%s, \csstring\%s, \csstring\%s',
node.rangedimensions(tex.box[0], tex.box[0].head))) }
-------------------------------------------------------------
-------------------------------------------------------------
This is LuaTeX, Version 1.12.0 (TeX Live 2020/Debian)
restricted system commands enabled.
(./bug.tex
11, 2, 3)
warning (pdf backend): no pages of output.
Transcript written on bug.log.
-------------------------------------------------------------
where the fourth line should be 1, 12, 3.
The cause of this problem seems to be the function natural_sizes()
defined in packaging.c; it looks like it was written with only
horizontal lists in mind.
This assumption also causes trouble with horizontal rules:
-------------------------------------------------------------
\setbox0 = \vbox{
\hrule height 1sp width 2sp
\hrule height 1sp }
\setbox1 = \vbox{
\hrule height 1sp width 2sp
\hrule height 1sp width 2sp }
\directlua{
texio.write_nl (string.format(
'\csstring\%s, \csstring\%s, \csstring\%s',
node.rangedimensions(tex.box[0], tex.box[0].head)))
texio.write_nl (string.format(
'\csstring\%s, \csstring\%s, \csstring\%s',
node.rangedimensions(tex.box[1], tex.box[1].head))) }
-------------------------------------------------------------
-------------------------------------------------------------
This is LuaTeX, Version 1.12.0 (TeX Live 2020/Debian)
restricted system commands enabled.
(./bug.tex
-1073741822, 1, 0
4, 1, 0)
warning (pdf backend): no pages of output.
Transcript written on bug.log.
-------------------------------------------------------------
where the reported numbers should in both cases be 2, 2, 0.
Regards,
Esger Renkema
