How to preview pictures in Shotwell while importing?

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http://askubuntu.com – Shotwell shows no photo thumbnails while importing. I was trying to download some pictures from my camera (Canon EOS 400D) with Shotwell and it seems the program doesn't show any preview for the pictures before downloading them (it just shows a "forbidden" snapshot). After importing them everything seems fine. I've found this bug report but no solution is given for now. It seems there could be a solution for EOS cameras, according to the last comment. This guy links to a patch, but it's not downloadable. Any ideas of where to obtain a deb package of this patch or of any other solution? (HowTos)