--- a/src/luan/modules/swing/UndoManagerLuan.java	Tue Apr 15 22:12:54 2025 -0600
+++ b/src/luan/modules/swing/UndoManagerLuan.java	Wed Apr 16 09:38:28 2025 -0600
@@ -1,8 +1,6 @@
 package luan.modules.swing;
 
 import java.util.WeakHashMap;
-import java.util.List;
-import java.util.ArrayList;
 import javax.swing.event.UndoableEditListener;
 import javax.swing.event.UndoableEditEvent;
 import javax.swing.undo.UndoManager;
@@ -25,7 +23,8 @@
 	private final WeakHashMap<LuanFunction,Boolean> map = new WeakHashMap<LuanFunction,Boolean>();
 	private final Luan luan;
 	private UndoableEdit unedited = null;
-	private final List<CompoundEdit> transactions = new ArrayList<CompoundEdit>();
+	private CompoundEdit transaction;
+	private int transactionNesting = 0;
 
 	public UndoManagerLuan(Luan luan) {
 		this.luan = luan;
@@ -42,12 +41,11 @@
 	}
 
 	@Override public void undoableEditHappened(UndoableEditEvent event) {
-		int n = transactions.size();
-		if( n == 0 ) {
+		if( transactionNesting == 0 ) {
 			super.undoableEditHappened(event);
 			notifyListeners();
 		} else {
-			if( !transactions.get(n-1).addEdit( event.getEdit() ) )  throw new RuntimeException();
+			if( !transaction.addEdit( event.getEdit() ) )  throw new RuntimeException();
 		}
 	}
 
@@ -82,19 +80,18 @@
 
 	public void beginTransaction() {
 		//logger.info("beginTransaction");
-		transactions.add(new CompoundEdit());
+		if( transactionNesting == 0 )
+			transaction = new CompoundEdit();
+		transactionNesting++;
 	}
 
 	public void endTransaction() {
 		//logger.info("endTransaction");
-		int n = transactions.size();
-		CompoundEdit ce = transactions.remove(n-1);
-		ce.end();
-		if( n == 1 ) {
-			if( !addEdit(ce) )  throw new RuntimeException();
-		} else {
-			if( !transactions.get(n-2).addEdit(ce) )  throw new RuntimeException();
+		transactionNesting--;
+		if( transactionNesting == 0 ) {
+			transaction.end();
+			if( !addEdit(transaction) )  throw new RuntimeException();
+			notifyListeners();
 		}
-		notifyListeners();
 	}
 }