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Please describe exactly what actions triggered the bug, and
the precise symptoms of the bug.  If you can, give a recipe
starting from `emacs -Q':

This is a funny bug, setup emacs with a black background and eval the
following in the scratch buffer:

(gnus-splash)

The picture is completely messed up with white boxes. It's a regression,
it worked fine with 92. I have attached a picture since it's difficult
to explain.