Originally posted as a gthumb bug (https://bugzilla.gnome.org/show_bug.cgi?id=678106), however as it went away when using GNOME rather than XFCE4 I wasnt able to show it was a bug with the program.
I dont know where to post this for XFCE4, so starting with the window manager.
From original bug report:
Prior to v3, I would routinely open an image/images in a directory and in the
image viewer mode (rather than the directory overview) use the Delete key or
Shift+Delete to remove images. It seems that the keybinding has been dropped?
Delete or Shift+Delete no longer work, and you have to right click -> Delete.
The normal keybindings work in the directory overview mode (but you see smaller
versions of the pictures naturally).
Depending on the number of images to go through this is a minor or major
usability problem for me.
uname -a: Linux 3.2.0-2-amd64 #1 SMP Fri Jun 1 17:49:08 UTC 2012 x86_64
Debian Testing (Wheezy)
gthumb Version: 3:3.0.0-2
Desktop environment: XFCE4 v220.127.116.11