% cat test.svg
<svg viewBox="-2 -15 40 20">
<text font-size="20" stroke="red" transform="scale (0.5, 1)">ABC</text>
</svg>
% rsvg-convert -f pdf -o test.pdf test.svg
The resulting pdf has the outline (stroke) correctly, but the filled
letters are spaced without respecting the scale, see attached
screenshot from okular. When both x and y are scaled the same, the
result is correct. (Honestly, I find it hard to imagine what would
cause such a strange bug, shouldn't the placement of the letters
always be the same for stroke and fill?)