Comment 7 for bug 960046

If I try to apply this extension on a file that was extracted from a PDF file, then the block is flipped upside-down.

From what I was told on IRC, that's because of the layer transform, because if you open a PDF file, the content is on a single layer which is scaled and vertically flipped, apparently.

Indeed, if I create a new layer to my document and move the content to their, it works much better.