RFR: 8280482: Window transparency bug on Linux [v2]

[Tejesh R]

On Fri, 21 Jul 2023 09:37:54 GMT, Alexander Zvegintsev <azvegint at openjdk.org> wrote:

>> Removed. Also No need to test for full screen I guess, just the top row checking will be fine I guess. Updated the test to check only for top row.
>
>> Also No need to test for full screen I guess, just the top row checking will be fine I guess. 
> 
> This area is very dependent from screen arrangement:
> 
> ![image](https://github.com/openjdk/jdk/assets/77687766/79fe8b04-7cdf-493b-bf2d-2f653d1af134)
> 
> ![image](https://github.com/openjdk/jdk/assets/77687766/0cc5a552-a437-4a40-bfe8-20dbf8ba43fd)
> 
> 
> ![image](https://github.com/openjdk/jdk/assets/77687766/994c0ca0-c28f-482d-81e8-f21a9c7e9af7)
> 
> ![image](https://github.com/openjdk/jdk/assets/77687766/7662602f-1f4e-421f-8cc1-25524049e133)
> 
> ![image](https://github.com/openjdk/jdk/assets/77687766/86978049-b385-48ee-8058-ab8a9dbb3eb2)
> ![image](https://github.com/openjdk/jdk/assets/77687766/1255b7ec-2e3b-4a5e-ae36-0ca59462843a)

Ok, didn't try with these settings. Will check for full screen then.

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PR Review Comment: https://git.openjdk.org/jdk/pull/14825#discussion_r1270481466