a2b34631 broke rsvg_handle_get_position_sub if there's a viewBox
Since a2b34631 rsvg_handle_get_position_sub returns the wrong coordindates if a viewBox
is defined in the svg.
Before that commit, the attached test program prints (as displayed in inkscape)
291 84
After that commit, the program prints
77 22
Compile the test program using
gcc $(pkg-config --libs --cflags librsvg-2.0) rtest.c