[NTG-context] Negative width vrule ignored in LuaMETATeX

[Wolfgang Schuster]

SAO Ocean schrieb am 24.04.2020 um 16:42:
> Hi,
> 
> 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:
> 
> \starttext
> a\vrule width -5pt height 0pt depth 0pt b
> \stoptext
> 
> 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?

\starttext
a\kern-5pt\relax b
\stoptext

or

\starttext
a\nobreak\hskip-5pt\relax b
\stoptext

Wolfgang