8361067: Test ExtraButtonDrag.java requires frame.dispose in finally block

[ravigupta30]

Test test/jdk/java/awt/Mouse/MouseModifiersUnitTest/ExtraButtonDrag.java left debris on system whenever fails its required frame.dispose() in finally block.

 finally {
            EventQueue.invokeAndWait(ExtraButtonDrag::disposeFrame);
        }
    public static void disposeFrame() {
        if (frame != null) {
            frame.dispose();
            frame = null;
        }
    }

---

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Issue

• JDK-8361067: Test ExtraButtonDrag.java requires frame.dispose in finally block (Bug - P4)

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• 01: Full - Incremental (1a2cb6e0)
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[ravigupta30]

any volunteer for review?