[NTG-context] bizarre bug in xml

[Wolfgang Schuster]

Thomas A. Schmitz schrieb am 20.11.2020 um 22:44:
> 
> Hi all,
> 
> this is the most bizarre bug I've ever seen in context. I would be 
> grateful if others could try to replicate it. Test file:
> 
> \startbuffer[test]
> <document>
>      <hskip width="1em"/>Materiam vati da Venus alma tuo.
> </document>
> \stopbuffer
> 
> \startxmlsetups xml:testsetups
>          \xmlsetsetup{#1}{*}{-}
>      \xmlsetsetup{#1}{document|
>              hskip}{xml:*}
> \stopxmlsetups
> 
> \xmlregistersetup{xml:testsetups}
> 
> \startxmlsetups xml:document
>     \xmlflush{#1}
> \stopxmlsetups
> 
> \startxmlsetups xml:hskip
>      \hskip\xmlatt{#1}{width}

     \hskip\xmlatt{#1}{width}\relax

> The file compiles cleanly if I give the --luatex switch.
> 
> Now for the bizarre part: if you delete the capital M of "Materiam" or 
> replace it by any other capital letter, the file compiles. What's going 
> on here?

Optional arguments (e.g. plus/minus values for \hskip) for commands are 
handled different in LMTX but it was always recommended to add \relax 
after the last value.

Wolfgang