Random failing org.eclipse.jface.text.tests.reconciler.FastAbstractReconcilerTest#testReplacingDocumentWhenClean()

[HeikoKlare]

org.eclipse.jface.text.tests.reconciler.FastAbstractReconcilerTest#testReplacingDocumentWhenClean() failed in a recent build (on MacOS): https://github.com/eclipse-platform/eclipse.platform.ui/pull/2704/checks?check_run_id=35665179984

reconciler never ran in 5 seconds
java.lang.AssertionError: reconciler never ran in 5 seconds
	at org.junit.Assert.fail(Assert.java:89)
	at org.eclipse.jface.text.tests.reconciler.AbstractReconcilerTest$Barrier.await(AbstractReconcilerTest.java:103)
	at org.eclipse.jface.text.tests.reconciler.AbstractReconcilerTest.testReplacingDocumentWhenClean(AbstractReconcilerTest.java:337)