/usr/share/zsh/functions/Zle/cycle-completion-positions is in zsh-common 5.3.1-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 | # This may be called after a completion that inserted the unambiguous
# (i.e. non-menu- and non-single-match-) string into the command line.
# If there are multiple positions in the string with missing or differing
# characters, repeatedly calling this widget cycles between all these
# positions.
emulate -L zsh
setopt extendedglob
local p="$_lastcomp[insert_positions]"
if [[ $p = ((#s)|*:)${CURSOR}:* ]]; then
CURSOR=${${p#(|*:)${CURSOR}:}%%:*}
elif [[ -n $p ]]; then
CURSOR=${p%%:*}
fi
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