[NTG-context] Negative width vrule ignored in LuaMETATeX

SAO Ocean shenao6626 at gmail.com
Fri Apr 24 16:42:00 CEST 2020


As I'm beginning to use ConTeXt LMTX, I experimented with it a little and
noticed some of my old documents different. After some examination I found the
following example:

a\vrule width -5pt height 0pt depth 0pt b

In LMTX, the result looks as if there is no `\vrule' between `a' and `b'. And if
I run with `context --engine=luatex', the expected result is back. I have
checked the luametatex manual but it doesn't seem to mention the difference. My
luametatex version is

mkiv lua stats  > used engine: luametatex version: 2.0502,
functionality level: 20200413, format id: 493, compiler: clang.

Is the behaviour expected? Or shall I use other method to get non-discardable
negative space?

Ao Shen

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