RFR: 8354552: Open source a few Swing tests

[Prasanta Sadhukhan]

On Wed, 16 Apr 2025 00:00:59 GMT, Damon Nguyen <dnguyen at openjdk.org> wrote:

>> Open source a few Swing regression tests.
>
> 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

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PR Review Comment: https://git.openjdk.org/jdk/pull/24668#discussion_r2046117640