The bar in the margin beside every changed or commented block, and the comment
bodies as a list after the document — a comment's text is nowhere on the page,
so a bar alone could only say that one exists. Resolved comments print nowhere,
and a document with no markup prints exactly as before.
The print engine clips to the page area (measured), so the vector path buys the
bar's strip out of the left @page margin and gives it back as padding. The
raster paths clone the editor's own layer and append the list as whole pages.