RFR: 8338153: java/awt/Checkbox/CheckboxCheckerScalingTest.java test failed on linux machine

[Harshitha Onkar]

On Tue, 27 Aug 2024 06:04:47 GMT, Tejesh R <tr at openjdk.org> wrote:

> Test failed intermittently on particular host. Though analysis pointed out to a test frame at left top on that host, I've updated the test for further stabilizing it. Two things done here:
> 1. Move the frame to center of the screen rather than left top.
> 2. Added tolerance checks for color comparison - this is based on analysis reports where the image didn't had exact black color which is supposed to be. So like other test cases, providing some tolerance for comparison.

As @kumarabhi006 and @alisenchung pointed out I think there might be cases of false positives with high tolerance values. 

Following are couple of suggestions:
- Check if a lower more optimal value of tolerance works. 
- Continue pixel compare till you encounter 4-5 pixels of the expected color (with tolerance) 
- Adding debug logs to see which colors pass the criteria.

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PR Review: https://git.openjdk.org/jdk/pull/20723#pullrequestreview-2273237979