Unreadable ruler in background on exported image

[klayoutmatthias]

The grid ruler printed into the image at the lower left corner becomes unreadable for bigger fonts.

For example try:

RBA::LayoutView::current.save_image_with_options("test.png", 4000, 3000, 10, 0, 1.0/10.0, RBA::DBox::new, false)

[klayoutmatthias]

Another issue is that the "linewidth" parameter of the "save_image_with_options" method does not have any effect.