New editor: ALT+ UP/DOWN move current line only if "editor.advanced" (hidden pref) is true. Fixes #3101

Author: Federico Fissore

app/src/processing/app/syntax/SketchTextAreaDefaultInputMap.java

@@ -1,15 +1,27 @@
 package processing.app.syntax;
 
 import org.fife.ui.rsyntaxtextarea.RSyntaxTextAreaDefaultInputMap;
+import org.fife.ui.rtextarea.RTextAreaEditorKit;
+import processing.app.PreferencesData;
 
 import javax.swing.*;
+import java.awt.event.InputEvent;
 import java.awt.event.KeyEvent;
 
 public class SketchTextAreaDefaultInputMap extends RSyntaxTextAreaDefaultInputMap {
 
   public SketchTextAreaDefaultInputMap() {
     int defaultMod = getDefaultModifier();
+    int alt = InputEvent.ALT_MASK;
 
     remove(KeyStroke.getKeyStroke(KeyEvent.VK_K, defaultMod));
+
+    if (PreferencesData.getBoolean("editor.advanced")) {
+      put(KeyStroke.getKeyStroke(KeyEvent.VK_DOWN, alt), RTextAreaEditorKit.rtaLineDownAction);
+      put(KeyStroke.getKeyStroke(KeyEvent.VK_UP, alt), RTextAreaEditorKit.rtaLineUpAction);
+    } else {
+      remove(KeyStroke.getKeyStroke(KeyEvent.VK_DOWN, alt));
+      remove(KeyStroke.getKeyStroke(KeyEvent.VK_UP, alt));
+    }
   }
 }