Reset keyboard state when window is deactivated/reactivated

src/main/java/jace/JaceApplication.java

@@ -58,7 +58,7 @@ public class JaceApplication extends Application {
             while (Emulator.computer.getVideo() == null || Emulator.computer.getVideo().getFrameBuffer() == null) {
                 Thread.yield();
             }
-            controller.connectComputer(Emulator.computer);
+            controller.connectComputer(Emulator.computer, primaryStage);
             bootWatchdog();
         });
         primaryStage.setOnCloseRequest(event -> {

src/main/java/jace/JaceUIController.java

@@ -10,6 +10,7 @@ import com.sun.glass.ui.Application;
 import jace.cheat.MetaCheat;
 import jace.core.Card;
 import jace.core.Computer;
+import jace.core.Keyboard;
 import jace.library.MediaCache;
 import jace.library.MediaConsumer;
 import jace.library.MediaConsumerParent;
@@ -43,6 +44,7 @@ import javafx.scene.layout.AnchorPane;
 import javafx.scene.layout.HBox;
 import javafx.scene.layout.StackPane;
 import javafx.scene.paint.Color;
+import javafx.stage.Stage;
 
 /**
  *
@@ -79,10 +81,11 @@ public class JaceUIController {
         rootPane.setOnDragExited(this::processDragExitedEvent);
     }
     
-    public void connectComputer(Computer computer) {
+    public void connectComputer(Computer computer, Stage primaryStage) {
         this.computer = computer;
         appleScreen.setImage(computer.getVideo().getFrameBuffer());
         EventHandler<KeyEvent> keyboardHandler = computer.getKeyboard().getListener();
+        primaryStage.setOnShowing(evt->computer.getKeyboard().resetState());
         rootPane.setFocusTraversable(true);
         rootPane.setOnKeyPressed(keyboardHandler);
         rootPane.setOnKeyReleased(keyboardHandler);

src/main/java/jace/core/Keyboard.java

@@ -39,6 +39,7 @@ import java.util.logging.Logger;
 import javafx.event.EventHandler;
 import javafx.scene.input.KeyCode;
 import javafx.scene.input.KeyEvent;
+import javafx.stage.WindowEvent;
 
 /**
  * Keyboard manages all keyboard-related activities. For now, all hotkeys are
@@ -50,6 +51,12 @@ import javafx.scene.input.KeyEvent;
  */
 public class Keyboard implements Reconfigurable {
 
+    public void resetState() {
+        clearStrobe();
+        openApple(false);
+        solidApple(false);
+    }
+
     private Computer computer;
 
     public Keyboard(Computer computer) {