[Bug 381668] Re: xfig produces illegal PNG file when exporting as PNG

[dominiko]

pngcheck tool also complains about the PNG file produced by xfig (so
it's not only optipng):

$ pngcheck foo.png 
foo.png  additional data after IEND chunk

-- 
xfig produces illegal PNG file when exporting as PNG
https://bugs.launchpad.net/bugs/381668
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