Fix syntax highlight completing before char added

src/main/java/app/controllers/EditorController.java

@@ -3,6 +3,7 @@ package app.controllers;
 import java.net.URL;
 import java.util.Collection;
 import java.util.ResourceBundle;
+import java.util.concurrent.CompletableFuture;
 
 import com.google.common.eventbus.EventBus;
 import com.google.common.eventbus.Subscribe;
@@ -19,7 +20,6 @@ import app.model.Model;
 import app.service.LanguageOperations;
 import javafx.fxml.FXML;
 import javafx.fxml.Initializable;
-import javafx.scene.input.KeyEvent;
 
 public class EditorController implements Initializable, Controller {
 
@@ -27,11 +27,18 @@ public class EditorController implements Initializable, Controller {
   private CodeArea editor;
 
   private EventBus eventBus;
-  private Model model;
 
+  /**
+   * Initializes the controller, and binds the event of change in editor content
+   * to {@link #editorChanged() editorChanged}
+   */
   @Override
   public void initialize(URL url, ResourceBundle resourceBundle) {
     editor.setParagraphGraphicFactory(LineNumberFactory.get(editor));
+
+    editor
+      .textProperty()
+      .addListener((obs, oldV, newV) -> this.editorChanged());
   }
 
   @Override
@@ -42,6 +49,7 @@ public class EditorController implements Initializable, Controller {
 
   /**
    * Applies highlighting to the editor.
+   * 
    * @param highlighting highlighting data
    */
   private void setHighlighting(StyleSpans<Collection<String>> highlighting) {
@@ -52,26 +60,17 @@ public class EditorController implements Initializable, Controller {
    * Recalculates and refreshes the syntax highlighting of the editor.
    */
   private void refreshHighlighting() {
-    this.setHighlighting(
-      LanguageOperations.syntaxHighlight(
-        this.editor.getText(),
-        Model.getLanguage()));
+    this.setHighlighting(LanguageOperations.syntaxHighlight(this.editor.getText(), Model.getLanguage()));
   }
 
   /**
    * Handles the event whenever the content of the editor is changed.
-   * @param event JavaFX event containing metadata
    */
-  @FXML
-  public void editorChanged(KeyEvent event) {
+  public void editorChanged() {
     int offset = this.editor.getCaretPosition();
     Position pos = this.editor.offsetToPosition(offset, Bias.Forward);
-    this.eventBus.post(
-      new EditorChangedEvent(
-        event.getCode(),
-        pos.getMajor() + 1,
-        pos.getMinor()
-      ));
+    this.eventBus.post(new EditorChangedEvent(pos.getMajor() + 1, pos.getMinor()));
+
     this.refreshHighlighting();
   }