Comment 21 for bug 474956

Some more work done on the gradients in trunk r12286, which does not lead to correct showing a drawing with gradients (C++-code is improved, but still something is interfering with correct orientation).

Reference to further improve the code: open document format specification
   https://www.oasis-open.org/committees/download.php/20847/OpenDocument-v1.1-cs1.pdf