RFR: 8354552: Open source a few Swing tests

[Phil Race]

On Wed, 16 Apr 2025 05:45:08 GMT, Prasanta Sadhukhan <psadhukhan at openjdk.org> wrote:

>> test/jdk/javax/swing/JLabel/bug4945795.java line 61:
>> 
>>> 59:         JFrame mainFrame = new JFrame("Bug4945795");
>>> 60:         try {
>>> 61:             UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
>> 
>> Not sure if it makes much of a difference or is any better, but I was previously instructed to set `UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");` explicitly instead. Test runs fine anyway.
>
> I left a comment 
> 
>> 
>> We can set
>> UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
>> in main and throw exception if cannot be set so that it can be done before initializing PFJ

(1) Personally I've thought about complaining about all the tests that hardwire the internal class name of a a platform L&F so setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");  is what seems more wrong to me.

(2) "I left a comment"

yes I know, but I don't think it is necessary or better.

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PR Review Comment: https://git.openjdk.org/jdk/pull/24668#discussion_r2047728249