Finally, I found the culprit!
debian/patches/warnings contains a patch for NedMainWindow::draw(...) in
mainwindow.cpp that was intended to fix a warning about an unused
variable. The patch moves the two lines
cairo_scaled_font_t *scaled_font;
scaled_font = NedResource::getScaledFont(m_current_zoom_level);
into the
#ifdef HAS_SET_SCALED_FONT
The getScaledFont() method, however, has a side effect in that it calls
NedResource::createScaledFont(int zoom_level) (contained in
resources.cpp) (which itself contains several #ifdef HAS_SET_SCALED_FONT).
Obviously, createScaledFont must be called, whatever the value of
HAS_SET_SCALED_FONT is, because if I revert the patch then the PDF
export works as expected.
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