Hello, thanks for answering!
I viewed it in Adobe Acrobat Reader X version 10.1.8. As you suggest, it may be an issue with the viewer because of the following two reasons:
- The error did not appear in the built in pdf-viewer in chrome (no idea what it uses for rendering)
- Suddenly today, in the same version of Acrobat Reader, the error did not appear again
It did appear in most different zooming levels, but not all as I remember from last friday. And yes, it always showed up as a 1 pixel broad white border, even when zooming out.
Since I cannot make the issue reappear now, although using the same code when creating the document, this probably is a rendering issue rather than an issue with migradoc/pdfsharp.
Weird though