RFR: 8287912: GTK L&F : Background of tree icons are red [v3]

[Prasanta Sadhukhan]

On Mon, 5 Sep 2022 16:51:48 GMT, Abhishek Kumar <duke at openjdk.org> wrote:

>> Also, it's might be better to write the image in case of failure so that it gives an idea why it failed.
>
>> For me, test is not failing without the fix. Also, if you test entire width and fail if it is not red, it might encounter black pixel of text font too and might fail, so I think it's better to check width/2 to width -1 and not entire width.
> 
> Test was not failing without the fix because the second argument of getRGB method is height/2, and for that pixel value the returned color is red. 
> Changing the argument from height/2 to height/4 will fail the test without the fix otherwise it will pass the test.
> 
> Also writing the image in case of failure.

This looks ok .Please remove the empty 1st line in the test.

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PR: https://git.openjdk.org/jdk/pull/10112