Disable cut and copy if there is not selected text

Author: ar-vargas

Diff for: app/src/processing/app/Editor.java

@@ -1369,8 +1369,6 @@ private JMenu buildEditMenu() {
 
     menu.addSeparator();
 
-    // TODO "cut" and "copy" should really only be enabled
-    // if some text is currently selected
     JMenuItem cutItem = newJMenuItem(tr("Cut"), 'X');
     cutItem.addActionListener(new ActionListener() {
         public void actionPerformed(ActionEvent e) {
@@ -1515,6 +1513,21 @@ public void actionPerformed(ActionEvent e) {
       menu.add(useSelectionForFindItem);
     }
 
+    menu.addMenuListener(new MenuListener() {
+      @Override
+      public void menuSelected(MenuEvent e) {
+        boolean enabled = textarea.getSelectedText() != null;
+        cutItem.setEnabled(enabled);
+        copyItem.setEnabled(enabled);
+      }
+
+      @Override
+      public void menuDeselected(MenuEvent e) {}
+
+      @Override
+      public void menuCanceled(MenuEvent e) {}
+    });
+
     return menu;
   }