There is a flaw in the logic determining the minimum layout size when using FlowLayout. If the first component is hidden, the logic adds an extra HGAP
to the returned width.

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

public class FixMe {
    public static void main(String[] args) {
        JFrame frame = new JFrame();
        JPanel panel = new JPanel();
        LayoutManager layout = new FlowLayout(FlowLayout.LEFT, 100, 0);
JButton b1 = new JButton("B1");
JButton b2 = new JButton("B2");
panel.add(b1);
panel.add(b2);
frame.getContentPane().add(panel);
frame.pack();
frame.setVisible(true);
b1.setVisible(false);
System.out.println(layout.minimumLayoutSize(panel));
b1.setVisible(true);
b2.setVisible(false);
System.out.println(layout.minimumLayoutSize(panel));
    }
}
When first component is not visible you could see that minimumLayoutSize() increased by HGAP value (100). This is incorrect. It should not differ from the value obtained in the second case.
###@###.### 2005-04-19 07:39:41 GMT