Resolve deferred size comparisons before allocating span slots

tests/layout_dump.rs

@@ -11,7 +11,8 @@
 //! it is not drawn.
 
 use iris::harness::Harness;
-use iris::random::{Edits, grow};
+use iris::prelude::{Axis, Bound, SizeRule};
+use iris::random::{Edits, build, plan};
 
 fn env<T: std::str::FromStr>(name: &str, fallback: T) -> T {
     std::env::var(name)
@@ -28,7 +29,19 @@ fn every_cold_layout_is_printed() {
     let mut out = String::new();
     for seed in 1..=seeds {
         let mut harness = Harness::new((1920.0, 1200.0));
-        let (root, tree) = grow(&mut harness.rsc, seed, depth, &Edits::default());
+        let mut plan = plan(seed, depth, &Edits::default());
+        if std::env::var_os("IRIS_DUMP_UNBOUNDED").is_some() {
+            plan.walk_mut(&mut |node| {
+                if let Some(rules) = &mut node.size {
+                    for axis in Axis::BOTH {
+                        if rules[axis].bound() != Bound::ANY {
+                            rules[axis] = SizeRule::Free;
+                        }
+                    }
+                }
+            });
+        }
+        let (root, tree) = build(&mut harness.rsc, &plan);
         harness.state.root = Some(root);
         harness.frame();
         for (index, id) in tree.ids.iter().enumerate() {