RFR: 4912623: GTK L&F: Folder list of the JFileChooser is allowing multiple selection unlike native [v2]

[Abhishek Kumar]

On Tue, 13 Dec 2022 14:50:56 GMT, Prasanta Sadhukhan <psadhukhan at openjdk.org> wrote:

>> Abhishek Kumar has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Update for folder list and test review comment update
>
> Marked as reviewed by psadhukhan (Reviewer).

@prsadhuk From the last fix, all folders can be selected even if `multiselection` is set to `false` which seems incorrect.  

Updated in the latest fix. CI jobs are Ok. 

Please review the latest changes.

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PR: https://git.openjdk.org/jdk/pull/11627