RFR: 8208565: [TEST_BUG] javax\swing\PopupFactory\6276087\NonOpaquePopupMenuTest.java throws NPE

[Prasanta Sadhukhan]

On Mon, 18 Apr 2022 07:11:45 GMT, Prasanta Sadhukhan <psadhukhan at openjdk.org> wrote:

> Test was failing in the past owing to NPE while accessing JMenu probably owing to fact the test did not wait for UI to be visible before starting the test, so added a delay after the frame is made visible. Also, added disposal of frame.
> Also, it seems JDK-8213535 fix might be having a positive impact on this test.
> 
> Several iterations of this test in all platforms have passed (link in JBS).

Any reviewers?

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PR: https://git.openjdk.java.net/jdk/pull/8282