fonts exported to pdfs take on unwanted 3D shading

Please add information about OS/platform and Inkscape version (see Inkscape menu 'Help > About Inkscape') to the bug description.

A screenshot of a PDF does not allow to further investigate the reported issue - please attach the original SVG file (or a reduced test case affected by the same problem), and the copy saved as PDF.

Thanks for bearing with me. Here is the information you requested.
Inkscape Version 0.48.3.1 r9886
OS: Ubuntu 12.04
Hardware Lenovo Ideapad Z580
Original svg file is attached. The problem is with the words "Upon Regrowth"

AFAICT this is similar to
- Bug #1245240 “Saving outlined text as PDF: progressive shift of the outline relatively to the character”
  <https://bugs.launchpad.net/inkscape/+bug/1245240>

The affected text object in the SVG file has a thin black stroke applied in addition to the black fill. On PDF export, there are two objects generated, a path (the outline) for the stroke, text for the fill. These two objects don't match exactly, though details seem to vary.

Workaround: remove the black stroke from the text (the difference is barely noticeable at 100% zoom level).

Reproduced on OS X 10.7.5 with
- Inkscape 0.48.3.1, cairo 1.12.2
- Inkscape 0.48+devel r13508, cairo 1.12.16
- Inkscape 0.48.5, cairo 1.12.16
- Inkscape 0.48+devel r13508, cairo git master

Underlying issue also tracked in e.g.
- Bug #1099005 “Saving text to PDF causes fill and outline to separate”
  <https://bugs.launchpad.net/inkscape/+bug/1099005>