production

test/home_structure_test.dart

@@ -134,11 +134,30 @@ void main() {
           anyOf(isNull, isEmpty),
           reason: 'a shadow lifts a group off the page; the spine groups it',
         );
-        expect(
-          d.border,
-          isNull,
-          reason: 'an outline around a group is the card by another name',
-        );
+        // ── A rule between rows is not an outline around them ──
+        //
+        // This required `border` to be null outright, which caught the thing
+        // it was written for — a rectangle drawn round a kitchen — and also
+        // catches a one-sided hairline separating one order from the next.
+        // Those are opposites: a box groups by enclosing, a rule separates by
+        // dividing, and the second is the spine's own grammar rather than a
+        // competitor to it. What stays banned is an enclosure.
+        final border = d.border;
+        if (border is Border) {
+          expect(
+            border.left.style == BorderStyle.none &&
+                border.right.style == BorderStyle.none &&
+                border.top.style == BorderStyle.none,
+            isTrue,
+            reason: 'an outline around a group is the card by another name',
+          );
+        } else {
+          expect(
+            border,
+            isNull,
+            reason: 'an outline around a group is the card by another name',
+          );
+        }
       }
 
       // ── What a fill may be here, since the route moved onto a panel ──