RFR: 8283214: [macos] Screen magnifier does not show the magnified text for JcomboBox [v5]

[Alexey Ivanov]

On Fri, 21 Jul 2023 19:32:07 GMT, Abhishek Kumar <abhiscxk at openjdk.org> wrote:

>> src/java.desktop/macosx/classes/com/apple/laf/AquaComboBoxButton.java line 242:
>> 
>>> 240:                 ac.setAccessibleName(label.getText());
>>> 241:             }
>>> 242:         }
>> 
>> How it will work in other L&Fs?
>
> In case of other LAFs except **Aqua** in MacOS, the accessible component invoked for screen magnifier is an instance of `AccessibleJComboBox` and subsequently the a11y API called on `AccessibleJComboBox` to return the accessible name.
> 
> But for aqua, the accessible component invoked for screen magnifier is an instance for `AquaComboBoxButton`, so it is required to return the accessible button instance for a11y APIs to get called for retrieving accessible name.

That's exactly my concern: in other L&Fs `AccessibleJComboBox` handles the scenario yet in Aqua L&F it is handled by a different component which is not a problem okay per se. What is a problem is that retrieving the accessible name depends on paint:
* if `AquaComboBoxButton.paint` hasn't been called for whatever reason, there's no accessible name;
* if the value in the combo box is changed, the accessible name isn't updated until paint occurs.

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PR Review Comment: https://git.openjdk.org/jdk/pull/14497#discussion_r1272656451