Thank you for deleting the sane fdi
(I already made the "add|change" to my /etc/.../sane.rule.)
Much like the Hydra which Hercules killed in the swamps near the ancient city of Lerna in Argolis, delete one fdi, another appears. ./l/libgphoto2-2.5.2-x86_64-1.txz has added its own hal fdi file which appears to contain the entire cast of udev rules for gphoto2 cameras.
Apcupsd appears to have joined the party, too, but that's from sourceforge, not Slackware.
Gotta wonder if HAL is in the wings awaiting its cue to enter stage-left as the new hal-phoenix risen from the ashes of ex-hal, a consummation devoutly to be wished!