The tests/system/src/test/java/test/robot/javafx/embed/swing/SwingNodeJDialogTest.java test timeouts after implementing the ScreenCast screen capture for JavaFX(JDK-8326712), this requires a fix on OpenJDK side.

It happens due to the call to gtk->g_main_context_iteration(NULL, TRUE) when we try to capture screen data, this blocks the gtk fx main loop.


Possible solutions are:

1. make a busy wait loop if we detect a gtk loop running
gtk->g_main_context_iteration(NULL, gtk->gtk_main_level == 0);
This will prevent the SwingNodeJDialogTest from hanging, and receive pixel color successfully.

2. do the same change as in JDK-8326712, make a nested loop, this allows to get a pixel color, but the test still timed out, needs further investigation.