[Shotwell] Launching external editor

[Peter DO Smith]

After having imported DNG files from my camera I tried to launch an
external editor "Open with external editor" and got the following
error

Unable to launch editor: Size of Exif JPEG segment is larger than 65535 bytes.

However if I open with RAW editor it launches Ufraw and everything
works properly. Gimp is set as my image editor and it is registered in
my copy of Ubuntu (10.04)
I am using today's svn trunk

Peter