fix: apply cargo fmt to resolve CI formatting check

Removes extra empty lines from issue_19_demo.rs to match
rustfmt formatting requirements for CI pipeline.

Author: gitcoder89431

examples/issue_19_demo.rs

@@ -18,106 +18,106 @@ use std::time::Duration;
 fn main() -> Result<(), Box<dyn std::error::Error>> {
     println!("🔄 Issue #19 Demo: App State Machine Extension for Settings");
     println!("===========================================================");
-    
+
     // Create a new App instance with dark theme
     let theme = Theme::new(ThemeVariant::EverforestDark);
     let mut app = App::new(theme);
-    
+
     println!("\n✅ App State Machine Extension Features:");
-    
+
     // 1. Demonstrate initial state
     println!("1. Initial State: {:?}", app.state());
     assert_eq!(*app.state(), AppState::Main);
-    
+
     // 2. Demonstrate state transitions
     println!("2. Testing state transitions...");
-    
+
     // Enter settings
     app.enter_settings();
     println!("   After enter_settings(): {:?}", app.state());
     assert_eq!(*app.state(), AppState::Settings);
-    
+
     // Exit settings (should return to Main)
     app.exit_settings();
     println!("   After exit_settings(): {:?}", app.state());
     assert_eq!(*app.state(), AppState::Main);
-    
+
     // 3. Demonstrate event handling
     println!("3. Testing event handling...");
-    
+
     // Simulate OpenSettings event
     let open_event = AppEvent::OpenSettings;
     println!("   Handling OpenSettings event...");
     // Note: handle_event is private, but we can test the public methods
     app.enter_settings();
     println!("   State after OpenSettings: {:?}", app.state());
-    
+
     // Simulate CloseSettings event
     let close_event = AppEvent::CloseSettings;
     println!("   Handling CloseSettings event...");
     app.exit_settings();
     println!("   State after CloseSettings: {:?}", app.state());
-    
+
     // 4. Demonstrate settings action handling
     println!("4. Testing settings actions...");
-    
+
     let initial_theme = app.settings().theme_variant();
     println!("   Initial theme variant: {:?}", initial_theme);
-    
+
     // Apply a settings action to change theme
     let action = SettingsAction::ChangeTheme(ThemeVariant::EverforestLight);
     app.handle_settings_action(action)?;
-    
+
     let new_theme = app.settings().theme_variant();
     println!("   Theme variant after action: {:?}", new_theme);
     assert_eq!(new_theme, ThemeVariant::EverforestLight);
-    
+
     // 5. Demonstrate state machine edge cases
     println!("5. Testing state machine edge cases...");
-    
+
     // Try multiple enter_settings calls
     app.enter_settings();
     app.enter_settings(); // Should still be in Settings
     println!("   After multiple enter_settings(): {:?}", app.state());
     assert_eq!(*app.state(), AppState::Settings);
-    
+
     // Exit should return to correct previous state
     app.exit_settings();
     println!("   After exit from multiple enters: {:?}", app.state());
     assert_eq!(*app.state(), AppState::Main);
-    
+
     // 6. Demonstrate event enum extensions
     println!("6. Testing extended AppEvent enum...");
-    
+
     let events = vec![
         AppEvent::OpenSettings,
         AppEvent::CloseSettings,
         AppEvent::SettingsAction(SettingsAction::ChangeTheme(ThemeVariant::EverforestDark)),
         AppEvent::ToggleTheme,
         AppEvent::Quit,
     ];
-    
+
     for event in &events {
         println!("   Event type: {:?}", event);
     }
-    
+
     println!("\n🎯 Success Criteria Verification:");
     println!("✅ AppState enum includes Settings variant");
     println!("✅ Clean state transition methods implemented");
     println!("✅ Previous state tracking for ESC handling");
     println!("✅ Event system supports settings workflow");
     println!("✅ Theme changes apply immediately");
     println!("✅ No state machine edge cases or deadlocks");
-    
+
     println!("\n🎨 State Machine Workflow:");
     println!("• Main → Settings: ',' key (AppEvent::OpenSettings)");
     println!("• Settings → Main: ESC key (AppEvent::CloseSettings)");
     println!("• Theme changes: Apply immediately via SettingsAction");
     println!("• State persistence: Previous state remembered for ESC");
-    
+
     println!("\n🚀 Issue #19 State Machine Extension: COMPLETE!");
     println!("   The app now supports a clean settings modal workflow");
     println!("   with proper state transitions and event handling.");
-    
+
     Ok(())
 }