Each artboard's DisplayMark was written as 0. It now holds the center
mark (1), cross hairs (2) and video safe areas (4), as the reader reads
them.
A pattern fill that would place more tiles than a fill places came back
with no tiles and was written as an empty group, so the shape was
missing from the editing copy. Such a shape is now filled gray, as a
pattern that isn't found is, with a warning.
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