gimp_file_save_thumbnail - Saves a thumbnail for the given image
SYNOPSIS
gimp_file_save_thumbnail (image,filename)
DESCRIPTION
This procedure saves a thumbnail in the .xvpics format for the given image. The thumbnail is saved so that it belongs to the file with the given filename. This means you have to save the image under this name first, otherwise this procedure will fail. This procedure may become useful if you want to explicitely save a thumbnail with a file.