Version:           0.9.4-svn (using KDE 3.5.9)
Installed from:    Gentoo Packages
OS:                Linux

This is a feature included in GIMP that quite often I miss in digikam. When I'm going to apply some filter or to do some adjustments to a picture (contrast, colours,...) normally I preffer to keep the original image opened in the image editor, and open a second editor with an exact copy of the image that exist only in RAM. My adjustments would be done in the image copy, and if the changes are OK then I could save the image to disk. In Gimp, this can be done using the option Image->Duplicate in the image editor. To me this is quite helpful many times.

I imagine that this change is not a big change in the sense of just copying a image in RAM, but this would have to add the ability of opening two image editors at the same time, one for the original image and another for the virtual copy of the image.