A selection moved with the Selection or Direct Selection tool that lines
up with nothing along an axis lands as far from its neighbour as two
other objects of its row (or column) are apart, or halfway between its
two neighbours, within the snapping tolerance; the equal gaps are marked
with a line and end ticks in the Smart Guides colour. The objects are
taken as wholes on their layers (groups too), and inside a group holding
the selection, its other objects. Off, moves only line up as before.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>