Auto scroll to end not working with GTextarea

Processing Electronics (Arduino, etc.)
3

Alternate technique using JTextArea which works as expected on macOS:

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.text.DefaultCaret;
import processing.serial.*;

javax.swing.JFrame frame;
java.awt.Canvas canvas;

JTextArea txtArea;
Serial myPort;

int _wndW = 300;
int _wndH = 620;

void setup() {
  frame = (javax.swing.JFrame) ((processing.awt.PSurfaceAWT.SmoothCanvas) surface.getNative()).getFrame();
  canvas = (processing.awt.PSurfaceAWT.SmoothCanvas) ((processing.awt.PSurfaceAWT)surface).getNative();
  frame.setBounds(500, 300, _wndW, _wndH);
  frame.remove(canvas);

  txtArea = new JTextArea();
  JScrollPane scrlPane = new JScrollPane(txtArea);
  scrlPane.setBounds(10, 10, 200, _wndH - 50);
  frame.add(scrlPane);
  txtArea.setEditable(true);
  txtArea.setLineWrap(false);
  txtArea.setWrapStyleWord(true);
  txtArea.repaint();

  printArray(Serial.list());
  String portName = Serial.list()[1]; // Adjust this if necessary
  myPort = new Serial(this, portName, 115200);
  DefaultCaret caret = (DefaultCaret)txtArea.getCaret();
  caret.setUpdatePolicy(DefaultCaret.ALWAYS_UPDATE);
}

void serialEvent(Serial myPort) {
  String inData = myPort.readStringUntil('\n');
  if (inData != null) {
    txtArea.append(inData);
  }
}

void draw() {
}
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