Bounding-box resizes with the Selection and Free Transform tools already lined
their edges up with the other objects (#355, after v0.4.0), but a handle never
landed on another object's anchor point, nothing was labelled, and the Rotate,
Scale, Shear and Reflect tools didn't snap their drags at all.
- Targets::snap_scale: the dragged corner (free, or along its diagonal with
Shift) or side lands on the nearest anchor or centre within the snapping
tolerance, labelled "anchor"/"center"; alignment snaps keep their line and
now say "align", as an artboard's resize handle does. Alt (from the centre)
and rotated boxes work the same way.
- The transform tools start a drag from the anchor or centre they grabbed (the
point a click would set) and snap the pointer as drawing tools do (Smart
Guides, the grid, pixels or Snap to Point), so a corner dragged onto another
object's anchor scales exactly onto it.
- Factor the nearest anchor/centre lookup (Targets::nearest_point) and the
transform tools' drag teardown (end_drag).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>