RFR: 8054572: [macosx] JComboBox paints the border incorrectly [v2]

[Prasanta Sadhukhan]

On Thu, 14 Jul 2022 16:25:12 GMT, Damon Nguyen <dnguyen at openjdk.org> wrote:

>. I tried these but none removed the border (even though appearance changes for a standard JButton in testing):
> 
> * arrowButton.setBorder(javax.swing.BorderFactory.createEmptyBorder());
> * arrowButton.setBorderPainted(false);
> * arrowButton.setFocusPainted(false);
> 
> The appearance of this button in JComboBox seems to be set by the JRS, thus making a change to the button's border not possible. This concern will be compiled in a list alongside other questions regarding appearance of a JComboBox.

Since the arrowButton is rendered by JRS, it needs to be instucted not to draw the border in that case..The above methods will not work as JRSUIPainter does not know about that, so one can call 
`painter.state.set(FOCUSED.NO)`
or something like that to remove the focused border.
Having said that, I dont think it will be correct to remove the border from the button as it is meant to show focus is on that component. 
Ideally, the textfield also should have a focus border around it similar to button, so it will look uniform, so instead of removing border from button, we can try to draw focus border around textfield (maybe something similar to JDK-7124282)

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