A dimension's block took a recolored copy named COMPARE_<tag>_D1, and
the DXF writer redraws a dimension whose block is not a *D block, so
saving the snapshot replaced geometry read from a file. The copy now
gets a free *D name.
A named block both drawings define was reused when its images and
data links had the same relative paths, even when they were relative
to different folders. These paths are now taken from each drawing's
folder before the blocks are compared.
dotCooCoo
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