Alternate Processing Editor Using processing-java.exe on the Command line

Thanks, that’s what I get for not using layout:

This works on Mac and Windows; replaced panel with a toolbar(no layout) other components used BorderLayout():

import javax.swing.*;
import java.awt.*;

import org.fife.ui.rsyntaxtextarea.*;
import org.fife.ui.rtextarea.*;

RSyntaxTextArea txtArea;
RTextScrollPane txtScrlPane;
JFrame frame;
JToolBar toolbar;

final int _wndW = 750;
final int _wndH = 700;

void setup() {
  surface.setVisible(false);
  txtArea = new RSyntaxTextArea();
  txtArea.setSyntaxEditingStyle(SyntaxConstants.SYNTAX_STYLE_JAVA);
  txtScrlPane = new RTextScrollPane(txtArea);
  frame = new JFrame("Editor");
  frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  toolbar = new JToolBar();
  toolbar.setFloatable(false);
  toolbar.setLayout(null);
  toolbar.setRollover(true);
  toolbar.setPreferredSize(new Dimension(_wndW, 50));
  frame.add(toolbar, BorderLayout.NORTH);
  frame.add(txtScrlPane, BorderLayout.CENTER);
  frame.setBounds(100, 100, _wndW, _wndH);
  frame.setVisible(true);
  SwingUtilities.invokeLater(() -> {
    //buildWnd(); // Build components on EventDispatchThread(EDT).
  }
  );
}

This obviates the need for component listeners to handle resizes and vertical scroller is full width on Windows 11. Thanks for the suggestion.