FULL PRODUCT VERSION :
openjdk version "14-ea" 2020-03-17
OpenJDK Runtime Environment (build 14-ea+23-1048)
OpenJDK 64-Bit Server VM (build 14-ea+23-1048, mixed mode, sharing)

ADDITIONAL OS VERSION INFORMATION :
Mac OS X

A DESCRIPTION OF THE PROBLEM :
When JOptionPane appears, Graphics2D.drawString for another component doesn't work with Mac OS X.
It works with Linux and Windows.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
1. Compile and launch the sample code
2. Input some characters to JTextField on JOptionPane.
3. Press enter key

EXPECTED VERSUS ACTUAL BEHAVIOR :
Expected:
Input text was drawn in Canvas on parent JFrame
Actual:
No drawing

REPRODUCIBILITY :
This bug can be reproduced always.

ADDITIONAL INFORMATION:
The original problem is about Java Input Method. The following are steps for Java IM case.
1. Enable CityIM demo
2. Launch OptionPaneInput sample here
3. Set focus to a passive component; in the sample, icon or button.
4. Input "jfk"
=> IM CompositeArea shows only "j".

---------- BEGIN SOURCE ----------
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class OptionPaneInput {
    public static void main(String[] args){
        JFrame f = new JFrame();
        Canvas c = new Canvas();
        JTextField t = new JTextField();
        f.add(c);

        t.addActionListener(e->{
                String text = t.getText();
                Graphics2D g2 = (Graphics2D)(c.getGraphics());
                g2.setColor(Color.BLACK);
                g2.drawString(text, 10, 10);
                System.out.println("drawing "+text);
        });

        f.setSize(300,100);
        f.setVisible(true);
        JOptionPane.showMessageDialog(f, t);
    }
}
---------- END SOURCE ----------