RFR: JDK-8282777: Create a Regression test for JDK-4515031 [v3]

[Srinivas Mandalika]

On Wed, 30 Mar 2022 10:05:22 GMT, Srinivas Mandalika <smandalika at openjdk.org> wrote:

>> Create a Regression test for [JDK-4515031](https://bugs.openjdk.java.net/browse/JDK-4515031)
>> 
>> The issue indicates the need for a a getAccessibleDescription being implemented for the JFileChooser.
>> The test added verifies the same.
>> This review is for migrating tests from a closed test suite to open.
>
> Srinivas Mandalika has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Review Comments Fixed: Button on EDT, split long lines, volatile description string

@mrserb can you please review the changes after incorporating the earlier feedback ?

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PR: https://git.openjdk.java.net/jdk/pull/7738