Code:


import java.util.logging.Level;
import java.util.logging.Logger;
import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.TextField;
import javafx.scene.layout.HBox;
import javafx.stage.Stage;

/**
 *
 * @author alexandr_kirov
 */
public class App2 extends Application {

    public static void main(String[] args) {
        new Thread(new Runnable() {

            @Override
            public void run() {
                try {
                    parallelThread();
                } catch (InterruptedException ex) {
                    Logger.getLogger(App2.class.getName()).log(Level.SEVERE, null, ex);
                }
            }
        }).start();

        launch(args);
    }
    static TextField tf;
    static String str = "one two three four five";

    @Override
    public void start(Stage stage) throws Exception {
        HBox vb = new HBox();

        tf = new TextField(str);
        tf.setPrefSize(100, 24);

        vb.getChildren().addAll(tf);

        Scene scene = new Scene(vb, 300, 300);
        stage.setScene(scene);
        stage.show();
    }

    public static void parallelThread() throws InterruptedException {
        Thread.sleep(1000);
        int len = str.length();
        tf.end();
        Thread.sleep(1000);
        tf.selectRange(1, len / 2);
    }
}

Run this code to see, that only "wo thr" is shown as selected, but actually, "ne two thr" is selected.

I think, this is different from RT-19749, because I use different commands (methods).