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1b1ed1a
(Get the code!)
Split away as second answer as i can not add multiple pictures per post.
The expectation is that if one sets 0.2mm copper to copper clearance and 0.1mm mask clearance, one can never have problems as no matter how badly misaligned the mask is it will still cover nearby copper. With the current way of calculating the two clearances this is not the case. If the misalignment is at 45° you will get free copper. (opposite of where the mask to pad clearance is reduced by the misalignement) Even with misalignment vector at 0 degree you will have a small area free of copper. (I showcase this by using a pad on bottom with the same settings but misaligned by 0.1mm. Note the areas of possible free copper near the corners of the mask.)