Opaque cursor to pass as cursor when reversing sortDirection.
This is only populated when the page contains at least one thread.
Use it with the opposite sortDirection; for timestamp sorts it anchors
at the start of the page timestamp so same-second updates are not skipped.
Opaque cursor to pass as
cursorwhen reversingsortDirection. This is only populated when the page contains at least one thread. Use it with the oppositesortDirection; for timestamp sorts it anchors at the start of the page timestamp so same-second updates are not skipped.