Remove extraenous blank grid state.

src/slide/s4_automata.rs

@@ -25,11 +25,7 @@ pub struct Automata {
     conway_portrait: Option<TextureHandle>,
 }
 
-#[derive(Default)]
 enum AutomataState {
-    /// Nothing on the grid.
-    #[default]
-    Empty,
     /// Random colors on the grid, but no simulation.
     Static {
         /// When started fading in "alive" arrow.
@@ -54,9 +50,15 @@ impl Default for Automata {
         // Unique identifier for the grid.
         life.name = "life";
 
+        randomize_grid(&mut life);
+
         Self {
             life,
-            state: AutomataState::default(),
+            state: AutomataState::Static {
+                alive: None,
+                dead: None,
+                rules: [None; 3],
+            },
             governor: Governor::default(),
             conway_portrait: None,
         }
@@ -66,15 +68,6 @@ impl Default for Automata {
 impl Slide for Automata {
     fn transition(&mut self, ctx: &Context) -> bool {
         match &mut self.state {
-            AutomataState::Empty => {
-                self.state = AutomataState::Static {
-                    alive: None,
-                    dead: None,
-                    rules: [None; 3],
-                };
-
-                randomize_grid(&mut self.life);
-            }
             AutomataState::Static { alive, dead, rules } => {
                 // Enable arrows/text one by one.
                 if alive.is_none() {
@@ -135,7 +128,6 @@ impl Slide for Automata {
         const HORIZONTAL_OFFSET: f32 = 250.0;
 
         match &mut self.state {
-            AutomataState::Empty => {}
             AutomataState::Static { rules, .. } => {
                 if let Some(first_rule_fade_start) = rules[0] {
                     let elapsed = ui.ctx().input().time - first_rule_fade_start;