RFR: 8272329: Cherry pick GTK WebKit 2.32.3 changes

[Ambarish Rapte]

On Sat, 14 Aug 2021 09:13:25 GMT, Johan Vos <jvos at openjdk.org> wrote:

>> modules/javafx.web/src/main/native/Source/WebCore/page/FrameViewLayoutContext.cpp line 393:
>> 
>>> 391:     const Seconds layoutScheduleThreshold = 250_ms;
>>> 392:     m_layoutTimer.startOneShot(layoutScheduleThreshold);
>>> 393: #else
>> 
>> I presume there was some change in the imported WebKit commits that made this changes necessary?
>
> 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 it was missed during webkit update, and caused [JDK-8269067](https://bugs.openjdk.java.net/browse/JDK-8269067) : CSSFilterTest fails intermittently in Windows. 
Taking this change back seems like good idea.

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