[bug #12412] NSImageRep's drawAtPoint: and drawInRect: shouldn't assume zero size if delegate exist.

[Gregory John Casamento]

Follow-up Comment #1, bug #12412 (project gnustep):

OPENSTEP4.2/Mach does not seem to make the assumption that
drawAtPoint:/drawAtRect: should return NO, if the size is zero.  

When testing this using the NeXTGo application in the gap project (which also
compiles and runs on OPENSTEP) on OPENSTEP the application renders it's images
just fine.  NeXTGo utilizes a NSCustomImageRep and draw the images into the
object using postscript calls. 

Currently, under GNUstep, neither the board, nor the pieces get rendered
properly. I am going to do some further testing with other apps and come up
with a minimal test case.  Barring any objections, I'm going to commit the
change to gui if all goes well.

Please see the NeXTGo application at:
https://savannah.nongnu.org/projects/gap

GJC

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