I now have it working with 1.0.25. It is necessary to add the lines # HP Scanjet G3110 usb 0x03f0 0x4305 to the /etc/sane.d/hp3900.conf file. I had to do this under 13.2. I tried this with 1.0.24 under Leap 42.1, but maybe the file was overwritten in one of my many attempts to get xsane working.