RFR: JDK-8297412: Remove easy warnings in javafx.fxml, javafx.media, javafx.swing, javafx.swt and javafx.web [v5]

[John Hendrikx]

On Tue, 29 Nov 2022 21:36:11 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

>> I think that we should refrain from making "structural" changes in this pass. Let's keep the warning on and deal with these later.
>
> I see that this change has been reverted. That's good.
> 
> FWIW, I disagree with the original premise of removing it. The subclass shouldn't have to know or care that the superclass method is empty or not.
> 
> I looked through the current version, and no longer have any concerns about this PR. I'll let others formally review.

Although there are many ways to implement this kind of inheritance, I do think that what I did here was also a valid solution.  The parent class was already `abstract` -- all I did was to make the `processEndElement` abstract instead of empty, forcing the subtypes to think about it and implement it.  Calling `super` is then no longer allowed.  I did not remove `super` because I knew it was empty, I removed it because it was now `abstract`.

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PR: https://git.openjdk.org/jfx/pull/958