#Paint Bug?
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Quoting fromt the Amiga Basic manual:
The borderColor-id identifies the color of the edge of the of the region to
be painted. If you omit this parameter, Amiga Basic uses the color
specified by paintColor-id.
In case it doesn't say this in your manual, I should tell you that this
comes from the Amiga Basic manual I received with my German designed
A2000.