RFR: 8285698: Create a test to check the focus stealing of JPopupMenu from JComboBox

[Manukumar V S]

On Wed, 27 Apr 2022 11:22:48 GMT, Manukumar V S <mvs at openjdk.org> wrote:

> This test verifies that showing a JPopupMenu shouldn't steal the focus out of current focused component..
> This fix moves an unstable closed test to open but updated to be more comprehensive in testing multiple Look and Feels and with some stabilisation improvements. The closed test had some dependencies with some proprietary libraries which are all removed here.
> 
> Testing:
> Tested using mach5 10 times per platform and got all Pass.

Any volunteers?

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PR: https://git.openjdk.java.net/jdk/pull/8426