Note that other SVG viewers (tested with Firefox 3.5.9, Safari 4.0.5, rsvg-view 2.26.2, Squiggle (Batik 1.7) [1] on OS X 10.5.8) all render the SVG file the same way as (cairo-based) PDF export from Inkscape.
The actual problem seems to be that Inkscape's renderer (used on-canvas and for bitmap export) is incorrect, not the exported PDF.
Note that other SVG viewers (tested with Firefox 3.5.9, Safari 4.0.5, rsvg-view 2.26.2, Squiggle (Batik 1.7) [1] on OS X 10.5.8) all render the SVG file the same way as (cairo-based) PDF export from Inkscape.
The actual problem seems to be that Inkscape's renderer (used on-canvas and for bitmap export) is incorrect, not the exported PDF.
[1] Batik is one of two authoritative SVG renderers for Inkscape wiki.inkscape. org/wiki/ index.php/ FAQ#Inkscape_ and_renderer_ X_show_ my_SVGs_ differently. _What_to_ do.3F>
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