[NTG-context] update old MP code

[Henning Hraban Ramm]

Am 01.09.22 um 18:45 schrieb Taco Hoekwater:
> 
> 
>> On 1 Sep 2022, at 18:28, Henning Hraban Ramm via ntg-context <ntg-context at ntg.nl> wrote:
>>
>> Am 01.09.22 um 15:40 schrieb Taco Hoekwater:
>>> Adding grouping makes sense:
>>>>
>>>> def Moire(expr size)(text densities)=
>>> begingroup
>>> endgroup
>>> As that at least makes it an expression instead of a statement list.
>>> But also depthless() is never defined?
>>
>> Oops, I forgot to copy that part (confusing source...)
>>
>> It still doesn’t compile:
> 
> Missing definition of “width()”, from this line:
> 
>>
>>           xs := width(q)-width(p);
> 
> Adding that should do the trick.

YES, thank you!

I never know which function is part of MetaPost/MetaFun, my editor’s 
syntax highlighting is incomplete...

Hraban
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