An edge that two contours of an area type frame share lies inside the
frame, and lines already run across it. Inset Spacing still kept text
clear of it, so a frame of contours that meet along an edge left a gap
of twice the inset at the seam. The inset now applies only beside the
stretches of edges that bound the frame, counted by parity as the line
spans are. A negative text wrap offset no longer shrinks a wrap object
beside an edge two of its contours share.
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