RFR: 8281988: Create a regression test for JDK-4618767

[Manukumar V S]

On Wed, 16 Feb 2022 14:58:48 GMT, Manukumar V S <mvs at openjdk.org> wrote:

> Create a regression test for [JDK-4618767](https://bugs.openjdk.java.net/browse/JDK-4618767)
> 
> Issue identified in [JDK-4618767](https://bugs.openjdk.java.net/browse/JDK-4618767):
> Typing a letter while a JList has focus now makes the selection jump to the first/next node/item whose text starts with that letter even though that letter is accompanied by modifier keys such as ALT or CTRL.
> 
> Fix:
> Only enable JList letter navigation when the user
> doesn't press any modifier keys such as ALT or CTRL.
> 
> Testing:
> I have verified this test with JDK 1.4.0 and JDK 1.4.1 .
> The issue is reproducible using the test with JDK 1.4.0 , where the bug was originally reported and the test passed in JDK 1.4.1 where the issue was fixed.
> I have tested it in Mac and Windows platforms multiple times and it passed everywhere.

@aivanov-jdk Can you please review this.

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PR: https://git.openjdk.java.net/jdk/pull/7496