Gtk+3: Replace deprecated gtk_widget_size_request with gtk_widget_get_preferred_size
[pspp] / src / ui / gui / artwork / mimetypes /
drwxr-xr-x   ..
drwxr-xr-x - 16x16
drwxr-xr-x - 22x22
drwxr-xr-x - 24x24
drwxr-xr-x - 256x256
drwxr-xr-x - 32x32
drwxr-xr-x - 48x48