RFR: 6450193: After the first Serialization, JTableHeader does not uninstall its UI [v3]

[Alexey Ivanov]

On Mon, 25 Sep 2023 06:53:49 GMT, Prasanta Sadhukhan <psadhukhan at openjdk.org> wrote:

>> test/jdk/javax/swing/JTableHeader/SerializeJTableHeader.java line 55:
>> 
>>> 53:         for (UIManager.LookAndFeelInfo laf : UIManager.getInstalledLookAndFeels()) {
>>> 54:             System.out.println("Testing L&F: " + laf);
>>> 55:             SwingUtilities.invokeAndWait(() -> setLookAndFeel(laf));
>> 
>> Why did you choose to set LAF on EDT? You then continue with creating and serialising the component on the main thread.
>
> I was not sure if any event processing needs to be done for lookandfeel change particularly native l&f like GTK and Aqua.
> Seems like it works with both EDT and non-EDT...tried with repeat count 50....so removed EDT usage...
> however GTK is not supported on headless environment so made the test run on headful environment.

I never thought about it… Yet if there's anything that depends on access to native platform, it probably needs to run on the toolkit thread.

I'm for keeping it simpler: if it works correctly on the main thread here, let's keep it this way.

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PR Review Comment: https://git.openjdk.org/jdk/pull/15507#discussion_r1335747606