Internal Frames do not have decorations corresponding to FlatLaf

(bug report split from issue #11)

Internal frame decorations are not correct for FlatLaf. Here is a simple test case:

    public static void main(String[] args) throws Exception {
        UIManager.setLookAndFeel(new FlatLightLaf());
        JFrame frame = new JFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        JDesktopPane desktopPane = new JDesktopPane();
        JInternalFrame internalFrame = new JInternalFrame("Test", true, true, true, true);
        internalFrame.setLocation(50, 30);
        internalFrame.setSize(300, 200);
        desktopPane.add(internalFrame);
        frame.getContentPane().add(desktopPane);
        frame.setSize(400, 300);
        frame.setVisible(true);
        internalFrame.setVisible(true);
    }

And here is the result:

[DevCharly]

@Chrriis thanks for your feedback.

I’ve made the buttons larger. That’s better!

[DevCharly]

implemented in 0.27