gthumb 3.0.1 - how to view, empty Trash?

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http://askubuntu.com – When I am browsing images with gthumb 3.0.1, hitting the DELete key removes the file from the browser (I assume by placing it into a gthumb Trash), but it remains on disk. And there appears to be no way to either view the gthumb Trash nor empty it. How does one view and/or empty the Trash - removing the files from the disk - in gthumb? (HowTos)