Pressing ESC cancels the selected command's key from being replaced

- focus is shifted away on esc
- focus is shifted away after successful change

#story[1197]

racevisionGame/src/main/java/visualiser/Controllers/KeyBindingsController.java

@@ -4,6 +4,7 @@ import javafx.application.Platform;
 import javafx.fxml.FXML;
 import javafx.scene.control.Button;
 import javafx.scene.control.ListView;
+import javafx.scene.input.KeyCode;
 import javafx.scene.input.KeyEvent;
 import javafx.scene.layout.AnchorPane;
 import visualiser.gameController.Keys.ControlKey;
@@ -112,8 +113,13 @@ public class KeyBindingsController {
      */
     public void setKeyListener(){
         anchor.addEventFilter(KeyEvent.KEY_PRESSED, event -> {
+            // if esc, cancel current button click
+            if (event.getCode() == KeyCode.ESCAPE){
+                btnCancel.requestFocus();
+                currentButton = null;
+            }
             // if a button was clicked
-            if (currentButton != null) {
+            else if (currentButton != null) {
                 // check if a button is already mapped to this key
                 for (int i = 1; i < lstKey.getItems().size(); i++) {
                     Button button = (Button)lstKey.getItems().get(i);
@@ -130,6 +136,7 @@ public class KeyBindingsController {
                         currentButton.getId());
                 // remove current button selection
                 currentButton = null;
+                btnCancel.requestFocus();
             }
             event.consume();
         });