Pattern fills in PDF output by `inkscape` are broken somehow. They disappear at low zoom in Okular and are not printed.
Using `rsvg-convert` seems to work better.
rsvg-convert input.svg --dpi-x 72 --dpi-y 72 -f pdf > output.pdf
DPI setting is necessary to get correct output page size, despite the SVG being measured in pt as output by potrace.
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