RFR: 8235404: [macos] JOptionPane blocks drawing string on another component [v2]

[Alisen Chung]

On Fri, 2 Aug 2024 00:22:00 GMT, Harshitha Onkar <honkar at openjdk.org> wrote:

>> test/jdk/javax/swing/JOptionPane/OptionPaneInput.java line 89:
>> 
>>> 87:         f.setVisible(true);
>>> 88: 
>>> 89:         JOptionPane.showMessageDialog(null, t);
>> 
>> Since parentComponent of JOptionPane is null running into NPE.
>> 
>> 
>>         parentComponent.revalidate();
>>         parentComponent.repaint();
>
> The fix should handle both cases - when parentComponent is null and not null. With current fix, if there is a case when parentComponent is null, we will run into NPE.

added null check

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PR Review Comment: https://git.openjdk.org/jdk/pull/20359#discussion_r1704431617