XmMultiListDeselectItems(3) on Linux
The text ce7eb38e59d8, as Debian 13 (Trixie), Debian 12 (Bookworm), Debian 11 (Bullseye), Debian 10 (Buster), Debian 9 (Stretch), Debian 8 (Jessie) shipped it.
A MultiList function that deselects items in the list by matching column entries "XmMultiListDeselectItems" "List functions" "XmMultiListDeselectItems"