frozen linear animateMotion and zero path length
The frozen value for linear animateMotion is tested for paths with fragments with zero path length.
The last value of the active duration is used as frozen value. If the last value is
the fragment with a path length of zero, this is choosen.
The animateMotion moves blue squares, red squares with the same motion are covered
always completely. The paths are given in gray.
If something red gets visible, an error is occured.
red comparison
blue testcase
blue testcase
blue testcase
blue testcase