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Possible image and thumbnail file states used by libgimpthumb.
| nothing is known about the file/thumbnail | ||
| the file is on a remote file system | ||
| the file is a directory | ||
| the file is a special file | ||
| the file/thumbnail doesn't exist | ||
| the file/thumbnail exists | ||
| the thumbnail may be outdated | ||
| the thumbnail couldn't be created | ||
| the thumbnail exists and matches the image |