Symbol and pattern art copied in by a placement takes ids of the
document's own, so the next placement of the same file compared it with
the file's art, found the ids different and added Star 2, Dots 2 and so
on. Definitions are now compared by what their art draws, whatever its
ids. A symbol, pattern or brush whose art uses an image, symbol, pattern,
brush or swatch that comes in under another name is copied under a free
name instead of shared.