src/share/classes/sun/swing/JLightweightFrame.java

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*** 235,244 **** --- 235,245 ---- @Override protected boolean isPaintingOrigin() { return true; } }; + contentPane.setOpaque(false); contentPane.setLayout(new BorderLayout()); contentPane.add(component); setContentPane(contentPane); contentPane.addContainerListener(new ContainerListener() {