RFR: 8054572: [macosx] JComboBox paints the border incorrectly [v4]

[Andrey Turbanov]

On Thu, 11 Aug 2022 15:47:40 GMT, Damon Nguyen <dnguyen at openjdk.org> wrote:

>> When a JComboBox is editable, the button segment of the combo box is misaligned vertically and has a different height. This change fixes these issues and adds a manual test that checks the appearance of an editable and non-editable JComboBox.
>> 
>> One of the discussions revolving this issue is the native macOS appearance of editable JComboBoxes. After looking through native macOS apps, the only one found is in System Preferences > Date & Time. The problem here is that the native equivalent found here uses a blue button with a single down arrow as the button's symbol. The current swing implementation uses a white button with an up & down arrow symbol for the button. A JRS widget button that has this blue button with a single downward arrow exists but does not support text fields.
>> 
>> As such, I believe the best fix for this issue is to mainly fix the alignment and sizing issue. I looked through Apple's documentation for these UI elements but editable JComboBoxes aren't specifically listed anywhere. Similarly, there's barely any editable JComboBoxes used in native mac apps (only the date & time). So, I don't think it's a major issue if JComboBox does not exactly match the example found in Date & Time.
>
> Damon Nguyen has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Removed newline.

src/java.desktop/macosx/classes/com/apple/laf/AquaComboBoxUI.java line 471:

> 469:             }
> 470: 
> 471:             if(comboBox.getComponentOrientation().isLeftToRight()) {

Let's add a space after `if`

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