WizardPageSupport fails for DataBindingContext with a Realm

[basilevs]

Following test fails in org.eclipse.core.databinding 1.13.300
Paste it into WizardPageSupportTest.java to reproduce.

public class org.eclipse.jface.tests.databinding.wizard.WizardPageSupportTest extends AbstractSWTTestCase {
	@Test
	public void testBackgroundRealm() {
		IWizardPage page = new WizardPage("Page") {
			@Override
			public void createControl(Composite parent) {
				setControl(parent);
				DataBindingContext dbc = new DataBindingContext(new org.eclipse.core.tests.databinding.observable.LockRealm());
				WizardPageSupport.create(this, dbc); // Should not throw an exception
			}
		};
		loadWizardPage(page);
	}
}

Error trace:

java.lang.RuntimeException: org.eclipse.core.runtime.AssertionFailedException: assertion failed: Getter called outside realm of observable org.eclipse.core.internal.databinding.observable.UnmodifiableObservableList@59f93db8
	at org.eclipse.jface.tests.databinding.BindingTestSetup.log(BindingTestSetup.java:56)
	at org.eclipse.core.databinding.observable.Realm$1.handleException(Realm.java:147)
	at org.eclipse.core.runtime.SafeRunner.handleException(SafeRunner.java:88)
	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:49)
	at org.eclipse.core.databinding.observable.Realm.safeRun(Realm.java:159)
	at org.eclipse.core.databinding.observable.Realm.exec(Realm.java:177)
	at org.eclipse.core.databinding.observable.value.ComputedValue.computeValueForListeners(ComputedValue.java:302)
	at org.eclipse.core.databinding.observable.value.ComputedValue.addValueChangeListener(ComputedValue.java:321)
	at org.eclipse.jface.databinding.dialog.DialogPageSupport.init(DialogPageSupport.java:144)
	at org.eclipse.jface.databinding.dialog.DialogPageSupport.<init>(DialogPageSupport.java:105)
	at org.eclipse.jface.databinding.wizard.WizardPageSupport.<init>(WizardPageSupport.java:47)
	at org.eclipse.jface.databinding.wizard.WizardPageSupport.create(WizardPageSupport.java:66)
	at org.eclipse.jface.tests.databinding.wizard.WizardPageSupportTest$4.createControl(WizardPageSupportTest.java:198)
	at org.eclipse.jface.wizard.Wizard.createPageControls(Wizard.java:180)
	at org.eclipse.jface.wizard.WizardDialog.createPageControls(WizardDialog.java:744)
	at org.eclipse.jface.wizard.WizardDialog.createContents(WizardDialog.java:637)
	at org.eclipse.jface.window.Window.create(Window.java:431)
	at org.eclipse.jface.dialogs.Dialog.create(Dialog.java:1092)
	at org.eclipse.jface.tests.databinding.wizard.WizardPageSupportTest.loadWizardPage(WizardPageSupportTest.java:252)
	at org.eclipse.jface.tests.databinding.wizard.WizardPageSupportTest.testBackgroundRealm(WizardPageSupportTest.java:201)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:568)
	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:59)
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:56)
	at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
	at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
	at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)
	at org.junit.rules.TestWatcher$1.evaluate(TestWatcher.java:61)
	at org.junit.runners.ParentRunner$3.evaluate(ParentRunner.java:306)
	at org.junit.runners.BlockJUnit4ClassRunner$1.evaluate(BlockJUnit4ClassRunner.java:100)
	at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:366)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:103)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:63)
	at org.junit.runners.ParentRunner$4.run(ParentRunner.java:331)
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:79)
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:329)
	at org.junit.runners.ParentRunner.access$100(ParentRunner.java:66)
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:293)
	at org.junit.runners.ParentRunner$3.evaluate(ParentRunner.java:306)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:413)
	at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:93)
	at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:40)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:530)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:758)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:453)
	at org.eclipse.pde.internal.junit.runtime.RemotePluginTestRunner.main(RemotePluginTestRunner.java:83)
	at org.eclipse.pde.internal.junit.runtime.CoreTestApplication.start(CoreTestApplication.java:28)
	at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:208)
	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:143)
	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:109)
	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:439)
	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:271)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:568)
	at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:679)
	at org.eclipse.equinox.launcher.Main.basicRun(Main.java:616)
	at org.eclipse.equinox.launcher.Main.run(Main.java:1492)
	at org.eclipse.equinox.launcher.Main.main(Main.java:1465)
Caused by: org.eclipse.core.runtime.AssertionFailedException: assertion failed: Getter called outside realm of observable org.eclipse.core.internal.databinding.observable.UnmodifiableObservableList@59f93db8
	at org.eclipse.core.runtime.Assert.isTrue(Assert.java:119)
	at org.eclipse.core.databinding.observable.ObservableTracker.getterCalled(ObservableTracker.java:258)
	at org.eclipse.core.databinding.observable.DecoratingObservable.getterCalled(DecoratingObservable.java:66)
	at org.eclipse.core.internal.databinding.observable.UnmodifiableObservableList.iterator(UnmodifiableObservableList.java:73)
	at org.eclipse.jface.databinding.dialog.MaxSeverityValidationStatusProvider.calculate(MaxSeverityValidationStatusProvider.java:37)
	at org.eclipse.jface.databinding.dialog.MaxSeverityValidationStatusProvider.calculate(MaxSeverityValidationStatusProvider.java:1)
	at org.eclipse.core.databinding.observable.value.ComputedValue$PrivateInterface.run(ComputedValue.java:168)
	at org.eclipse.core.databinding.observable.ObservableTracker.runAndMonitor(ObservableTracker.java:113)
	at org.eclipse.core.databinding.observable.value.ComputedValue.doGetValue(ComputedValue.java:196)
	at org.eclipse.core.databinding.observable.value.AbstractObservableValue.getValue(AbstractObservableValue.java:92)
	at org.eclipse.core.databinding.observable.value.ComputedValue.lambda$0(ComputedValue.java:309)
	at org.eclipse.core.databinding.observable.Realm$1.run(Realm.java:155)
	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:47)
	... 59 more

The problem is probably org.eclipse.jface.databinding.dialog.MaxSeverityValidationStatusProvider.MaxSeverityValidationStatusProvider(DataBindingContext) - it fails to propagate validation realm to the superclass.