l3backend: adding new DVI specials?

[Joseph Wright]

On 13/02/2020 23:09, Karl Berry wrote:
>      A "latex" run *cannot* know what the driver is unless it's told: you
> 
> Yes, of course.
> 
>      The graphics package has for years assumed no option -> dvips, and
> 
> Yes, and that is good.
> 
>      dvipdfmx users are thus accustomed to having to specify it.
> 
> Right. Ditto dvisvgm, etc. So, don't output the header= \special unless
> either no option is given, or dvips is explicitly given.
> What am I missing? Sorry ... -k
> 

Nothing: that's exactly what is happening. As I said to Norbert, I'm not 
familiar with with pyxplot, so can only guess that it works it DVI mode 
with some set of specials that are not the dvips ones, or at least not 
*all* of the dvips ones. Without example input, it's hard to know more.

Joseph