Bugs in ImageGraphics.drawLine?

I've been using ImageGraphics in Wonderland for shared apps, and it is awesome! But one thing I have noticed

is that ImageGraphics.drawLine doesn't handle the dirty region calculation correctly for horizontal and vertical lines. It also doesn't seem to handle wide lines. Are these known bugs?

Those are not really known bugs… I guess people were not using this class for such purposes… Are you able to fix it?