[NTG-context] Negative width vrule ignored in LuaMETATeX

[Hans Hagen]

On 4/24/2020 4:42 PM, SAO Ocean wrote:
> 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?

no, but i must admit that it's kind of a border case ... i'll fix it but 
also wonder if *no* visual rule showing up is intended (i would then 
also expect an engine to show a rule .. could be an interesting new 
(luametatex) option as it saves kerns in some cases)

see Wolfgangs mail for a better solution using kerns

Hans
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