Cleanup fade in transition.

src/slide/s4_automata.rs

@@ -212,19 +212,17 @@ impl Slide for Automata {
                     .title_bar(false)
                     .resizable(false)
                     .show(ui.ctx(), |ui| {
-                        // Nested fade in since fade doesn't propagate from [`Window`] to children.
-                        fade_in(ui, first_rule_fade_start + RULES_DELAY, |ui| {
-                            let rules = [
-                                "Cells with fewer than two neighbors die",
-                                "Cells with more than three neighbors die",
-                                "Cells with three neighbors become alive",
-                            ];
-                            for (rule, fade_start) in rules.into_iter().zip(rules_fade) {
-                                fade_in(ui, fade_start.unwrap_or(f64::INFINITY), |ui| {
-                                    ui.label(format!(" ⏵ {}", rule));
-                                });
-                            }
-                        })
+                        let rules = [
+                            "Cells with fewer than two neighbors die",
+                            "Cells with more than three neighbors die",
+                            "Cells with three neighbors become alive",
+                        ];
+                        for (rule, fade_start) in rules.into_iter().zip(rules_fade) {
+                            // Infinity is a kludge to make it invisible by still take up space.
+                            fade_in(ui, fade_start.unwrap_or(f64::INFINITY), |ui| {
+                                ui.label(format!(" ⏵ {}", rule));
+                            });
+                        }
                     });
             });
         }