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thumbnail_path did not include the actual filename in its result after calculating it. This breaks things in save_thumbnail which assumes receiving a file path rather than a directory path. See original code before clean ups at: https://git.gnome.org/browse/gnome-desktop/tree/libgnome-desktop/gnome-desktop-thumbnail.c?id=f2d25fa7d6cdaba03679f0fc0921fc5f81bd3944#n1060 https://bugzilla.gnome.org/show_bug.cgi?id=684026
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