Created attachment 6783 [details] document (not) displaying a single diagonal line The attached document renders a pixel-wide diagonal line in Adobe Reader but doesn't render anything at all with MuPDF. The code in question: 595 0 m 0 842 l h f See the URL for a real world document relying on such a zero-width fill to render.
It's a zero area fill. According to all logic it should not fill any pixels, nor do we support fill-adjust which may be able to deal with this. It'd be a different issue if the producer had actually used a zero-width stroke.