It's a workaround, but I would still consider this a bug. I was in fact
toying with the idea of changing the code so it doesn't crop. I'm not a
seasoned Scheme hacker but it doesn't seem too hard at all.

(a) change the core function so it accepts an additional parameter
"nocrop". For backward compatibility reasons, make this negated (nocrop
rather than, say, crop) and &optional. Make the cropping code
conditional: (when (not nocrop) (... do it ...)

(b) correspondingly change the user-friendly functions so that the
"alpha" effect never crops, and the regular one does, just like before.

-- 
"Alien Glow" effect crops too tightly
https://launchpad.net/bugs/41759

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