Comment 3 for bug 174720

I also encountered this issue when looking at gnuplot output. Attached is a simpler, hand written test case.
The upper row of squares uses currentColor, while the lower row has the colors that should have been used set explicitely. In a correct implementation (e.g. current Firefox) they should look identically.
The left half uses CSS styles while the right half uses XML attributes. In each of these halves, the left square should use the color specified for that square, while the right one should use the color of an enclosing group.
Looking at the result in Inkscape 0.46 it looks like the currentColor paint specifications were ignored altogether.