[luatex] node.rangedimensions on vertical lists

[luigi scarso]

On Tue, Oct 6, 2020 at 10:00 PM Esger Renkema <esgerrenkema at gmail.com>
wrote:

> 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
>
>
>

Thank you for the report,  I will see asap.


-- 
luigi
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