ArrowShapeUtil

Nothing binds to an arrow (no arrow-to-arrow bindings).

An arrow needs its family's faces only while it carries a label.

gapAtLabel splits the body around the label's box. Only the selection outline asks for it; the geometry the editor hit-tests keeps the body whole, so the stroke the label covers is still there to be clicked.

Start and end handles move (and bind) the terminals. Between them sits one virtual handle: an arc's bend handle rides the middle of the curve, while an elbow's midpoint handle sits on its middle leg and slides that leg. An elbow with no middle leg (an L route, or a straight run) has neither.

…and no rotate handle either, which is what actually suppresses the box. selectionHandles only drops the frame when resize *and* rotate are both hidden, so hiding one of the two left a selected arrow wrapped in a rectangle with a lone rotate dot above it. An arrow has nothing to rotate about: its ends are the two handles, and turning it means moving them.

A selected arrow shows its handles instead of a selection box.

…but the arrow's *own* outline is drawn. This flag suppresses a lone selected shape's indicator, and the arrow used to set it because the selection frame was the cue instead. With the frame gone there was no cue at all — a selected arrow showed nothing. Its indicator is the curve and the label's box, which is the cue worth having.

The GPU keeps drawing the arrow while its label is edited.

Dragging the arrow on its own detaches it: bindings to shapes that are not part of the selection are dropped and their terminals frozen in place. Bindings to shapes moving along with the arrow are kept.

kind is deliberately not among these. A style is shared across shape types, remembered for the next shape and applied to a whole selection at once; arc-versus-elbow is routing that belongs to the one arrow, and declaring it a style would put it in every mixed selection's shared styles (and in the style panel) with nothing else to share it with.