Allow Decals on PDFs#1892

Currently, Decals can be placed on PDFs, however they do not show up on the PDF when popped out, and also remain in place on the same place of the book while flipping through the pages, rendering them effectively useless.

Please allow it so that when you put a decal on a PDF, it only displays while on the page it was placed on, and also displays on the pop-out view.