RFR: 4912623: GTK L&F: Folder list of the JFileChooser is allowing multiple selection unlike native [v4]

[Abhishek Kumar]

On Thu, 15 Dec 2022 06:47:33 GMT, Abhishek Kumar <abhiscxk at openjdk.org> wrote:

>> It is not possible to select all files on press of Ctrl+A in JFileChooser for GTK LAF where as all folders can be selected. 
>> In native side on press of Ctrl+A, able to select all files as well as folders.
>> 
>> Proposed fix is to enable `multiselection `property by default for JFileChooser in GTK LAF to mimic native side behavior.
>> 
>> An automated test case is implemented and tested in CI. CI job links are attached in JBS.
>
> Abhishek Kumar has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Review comment update

@jayathirthrao Tested the CI jobs in GTK LAF, seems all ok. JFileChooser test `javax/swing/JFileChooser/FileSizeCheck.java` failed in GTK LAF as this test is not supposed to run in GTK LAF.

Can you please review?

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