A group (`u`), clipping group (`q`) or compound path (`*u`) opened after
the last layer and never closed was accepted, and the art inside it was
dropped without a message. The reader now stops with "it ends inside a
group or compound path", as it already does for data that ends inside a
layer. Pattern and symbol definitions, which are read inside a group of
their own, are not affected.
dotCooCoo
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