RFR: 8272329: Cherry pick GTK WebKit 2.32.3 changes

[Johan Vos]

On Fri, 13 Aug 2021 22:38:08 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

>> Cherry pick the GTK webkit 2.32.3 changes
>> https://webkitgtk.org/2021/07/23/webkitgtk2.32.3-released.html
>
> 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).

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