Tom Phelps - 2004-01-28

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This is a known problem and is being fixed, but it is involved and
will take a while.

This is the technical reason. Multivalent can reformat any
document, even fixed-format documents, such as scanned paper,
DVI, and PDF. I don't know of any other system that does this
incrementally -- adjusting existing layout. Acrobat can reflow
specially prepared text, but it throws out old layout and computes
an new HTML-like format. This capability is used by a type of
annotation that incrementally reformats to open up blank space
between lines and then writes a short message there.

It is implemented by comparing the original layout sizes with the
new sizes and determining new positions as needed. Right now in
PDF only the recomputed sizes do not match the original so the
new positions are incorrect. This is so even in the absence of
external changes, or changes that should not affect layout such as
drawing a box or drawing a different background color for search
hits.