[NTG-context] Transparency in external PDFs does not work

[Gerion Entrup <gerion.entrup@flump.de>]

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Hi,

I'm using LaTeX-Beamer and TikZ for figure typesetting.
With this combination, it is easy to combine Beamer's animation system with TikZ transparency feature.
This way, the resulting PDFs contain the full graphic on every page, but parts of it are invisible for a specific page.
One of these files is attached as an example.

The problem is to embed these PDFs into a ConTeXt document.
For example, this MWE seems to not respect transparency (see mwe.pdf):
```
\starttext
\externalfigure[fig.pdf][page=1]
\stoptext
```

I use Okular/Poppler as PDF viewer.
Can I fix this somehow or is it a bug somewhere deeper?

Best
Gerion

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