Retain request dependencies only when discovery supplies the answer

tests/cases/deferred.rs

@@ -92,18 +92,28 @@ fn request_edits_in_a_nested_child_reach_the_allocator() {
 
 #[test]
 fn adding_a_bound_to_a_previously_unbounded_share_reallocates_the_row() {
-    let mut h = Harness::new((300, 100));
-    let a = rect(Color::RED).add(&mut h.rsc);
-    let b = rect(Color::BLUE).add(&mut h.rsc);
-    h.set_root((a, b).span(Dir::RIGHT));
-    h.resize((400, 100));
-    h.frame();
-    h.rsc
-        .widgets_mut()
-        .set_size_rule(a, Axis::X, SizeRule::Max(Len::px(80.0)));
-    h.frame();
-    assert_corners!(h, a, (0, 0), (80, 100));
-    assert_corners!(h, b, (80, 0), (400, 100));
+    for hinted in [true, false] {
+        let mut h = Harness::new((300, 100));
+        let a = if hinted {
+            rect(Color::RED).add_strong(&mut h.rsc).any()
+        } else {
+            h.rsc.widgets_mut().add_strong(Unhinted).any()
+        };
+        let id = a.id();
+        let b = rect(Color::BLUE).add(&mut h.rsc);
+        let mut row = Span::empty(Dir::RIGHT);
+        row.push(a);
+        row.push(b.add_strong(&mut h.rsc));
+        h.set_root(row);
+        h.resize((400, 100));
+        h.frame();
+        h.rsc
+            .widgets_mut()
+            .set_size_rule(id, Axis::X, SizeRule::Max(Len::px(80.0)));
+        h.frame();
+        assert_corners!(h, id, (0, 0), (80, 100));
+        assert_corners!(h, b, (80, 0), (400, 100));
+    }
 }
 
 #[test]