Feature request:
Currently variable kill-do-not-save-duplicates checks
only the (car kill-ring) as docu explains:
Do not add a new string to ‘kill-ring’ if it duplicates the
last one.
The comparison is done using ‘equal-including-properties’.
AFAIU it would be trivial replace this check by a call of
"member", thus checking the whole kill-ring.
Thanks,
Andreas