RFR: 8272329: Cherry pick GTK WebKit 2.32.3 changes

[Johan Vos]

On Mon, 16 Aug 2021 06:59:18 GMT, Ambarish Rapte <arapte at openjdk.org> wrote:

>> That is a good question. I believe that was actually introduced because of JDK-8260165 (and removed in the next update by commit ed0baf5f23aed0d8aaa72645c8e03fde56d0f0cc) 
>> 
>> The problem with this 250ms delay is that in case the WebView is not visible, it's contents won't get updated until after 250ms. That is a major pain if the WebView is used for printing only (hence not for rendering).
>
> I think this change was lost during webkit update. and it caused a regression [JDK-8269067](https://bugs.openjdk.java.net/browse/JDK-8269067) : CSSFilterTest fails intermittently in Windows.
> This change was originally included to enable CSSFilterTest.
> Adding back this change sounds like a good idea to me.

The original addition of this #ifdef was due to JDK-8260165. That commit introduced the problems I mentioned above (WebView took 250ms to update if not visible), so I don't think it is a good solution. 
I suggest we discuss that in JDK-8269067 (but not include it in the PR with the cherry-pick of the changes, as it is not in the upstream webkit)?

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PR: https://git.openjdk.java.net/jfx/pull/603