8361524: [XWayland] possible JavaFX interop hang

[azvegint]

Callbacks in the src/java.desktop/unix/native/libawt_xawt/awt/screencast_portal.c file normally have the following pattern:

helper->isDone = TRUE;
callbackEnd();
// return;

Failing to call callbackEnd() could result in a hang if another GTK loop is running (e.g., JavaFX see #22131 (comment)).

This fix corrects this flaw.

---

Progress

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Issue

• JDK-8361524: [XWayland] possible JavaFX interop hang (Bug - P4)

Reviewers

• Prasanta Sadhukhan (@prsadhuk - Reviewer)
• Sergey Bylokhov (@mrserb - Reviewer)
• Phil Race (@prrace - Reviewer)

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8361524: [XWayland] possible JavaFX interop hang

Reviewed-by: psadhukhan, serb, prr

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At the time when this comment was updated there had been 203 new commits pushed to the master branch:

• ea6674f: 8315131: Clarify VarHandle set/get access on 32-bit platforms
• d714b5d: 8356557: Update CodeSource::implies API documentation and deprecate java.net.SocketPermission class for removal
• ce02836: 8363229: Parallel: Remove develop flag GCExpandToAllocateDelayMillis
• ... and 200 more: https://git.openjdk.org/jdk/compare/ec3bb93d7901c7756d7ff4cc18e4ae9d88942f93...master

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