Add Undo Redo support for the Note plugin (#5606)

Closes #5543

runelite-client/src/main/java/net/runelite/client/plugins/notes/NotesPanel.java

@@ -26,14 +26,19 @@
 package net.runelite.client.plugins.notes;
 
 import java.awt.BorderLayout;
+import java.awt.event.ActionEvent;
 import java.awt.event.FocusEvent;
 import java.awt.event.FocusListener;
+import javax.swing.AbstractAction;
 import javax.swing.BorderFactory;
 import javax.swing.JPanel;
 import javax.swing.JTextArea;
+import javax.swing.KeyStroke;
 import javax.swing.border.EmptyBorder;
 import javax.swing.text.BadLocationException;
 import javax.swing.text.Document;
+import javax.swing.undo.CannotUndoException;
+import javax.swing.undo.UndoManager;
 import lombok.extern.slf4j.Slf4j;
 import net.runelite.client.ui.ColorScheme;
 import net.runelite.client.ui.PluginPanel;
@@ -42,6 +47,7 @@ import net.runelite.client.ui.PluginPanel;
 class NotesPanel extends PluginPanel
 {
 	private final JTextArea notesEditor = new JTextArea();
+	private final UndoManager undoRedo = new UndoManager();
 
 	void init(NotesConfig config)
 	{
@@ -68,6 +74,53 @@ class NotesPanel extends PluginPanel
 		String data = config.notesData();
 		notesEditor.setText(data);
 
+		// setting the limit to a 500 as UndoManager registers every key press,
+		// which means that be default we would be able to undo only a sentence.
+		// note: the default limit is 100
+		undoRedo.setLimit(500);
+		notesEditor.getDocument().addUndoableEditListener(e -> undoRedo.addEdit(e.getEdit()));
+
+		notesEditor.getInputMap().put(KeyStroke.getKeyStroke("control Z"), "Undo");
+		notesEditor.getInputMap().put(KeyStroke.getKeyStroke("control Y"), "Redo");
+
+		notesEditor.getActionMap().put("Undo", new AbstractAction("Undo")
+		{
+			@Override
+			public void actionPerformed(ActionEvent e)
+			{
+				try
+				{
+					if (undoRedo.canUndo())
+					{
+						undoRedo.undo();
+					}
+				}
+				catch (CannotUndoException ex)
+				{
+					log.warn("Notes Document Unable To Undo: " + ex);
+				}
+			}
+		});
+
+		notesEditor.getActionMap().put("Redo", new AbstractAction("Redo")
+		{
+			@Override
+			public void actionPerformed(ActionEvent e)
+			{
+				try
+				{
+					if (undoRedo.canRedo())
+					{
+						undoRedo.redo();
+					}
+				}
+				catch (CannotUndoException ex)
+				{
+					log.warn("Notes Document Unable To Redo: " + ex);
+				}
+			}
+		});
+
 		notesEditor.addFocusListener(new FocusListener()
 		{
 			@Override