The corner widgets only showed when the selection was exactly one path.
Now every selected path that has them shows its widgets: live rectangles
and polygons with the Selection tool, any path with Direct Selection,
each with its own corners (all of a path selected whole, the
Direct-Selected ones otherwise). Dragging any widget rounds every shown
corner of every path in one step, Alt-click cycles their kind, and the
red limit outline covers them all; a double-click opens Corners for the
path it was on. Each widget is drawn in its own layer's colour.
object.setLiveShape takes items: [{id, corners?}], several objects each
with its own corners, which the drag sends.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>