RFR: 8054572: [macosx] JComboBox paints the border incorrectly [v5]

[Prasanta Sadhukhan]

On Thu, 11 Aug 2022 16:44:49 GMT, Damon Nguyen <dnguyen at openjdk.org> wrote:

> @andy-goryachev-oracle I took into consideration your comment regarding RTL and LTR behavior regarding JComboBoxes. I did the testing as we briefly discussed and all results led me to believe Aqua L&F combo boxes only supported the button being on the right. Will still need to check with a device natively set to RTL, but it turns out a nearly decade old JBS issue already exists for this JComboBox button issue. I'll leave that separate from this PR and possibly look into that other issue later.

Yes, [JDK-8023912](https://bugs.openjdk.org/browse/JDK-8023912)...
I am not sure if this RTL is an issue. I guess it was mentioned in our meeting that RTL should not affect JComboBox button. 
Maybe another question for apple, since the button image drawn by JRS?

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PR: https://git.openjdk.org/jdk/pull/9473