Clicking an object's target circle in the Layers panel always replaced
the selection, so several objects couldn't be picked there. Shift-click
now adds the object (a layer: its art) to the selection, or takes it out
when it is selected already, as in Illustrator; nothing stays targeted
then. layer.target takes add: true for it.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>