Bug 239015 [Databinding] ObservableListTreeContentProvider adds the value passed to TreeViewer#setInput() to the known-elements
The input element is never shown in the viewer so it should no get part of the knownElements further more it restricts the usability of the content-provider because the input-element itself already has to provide the required Observable-Attribute(s).
tests/org.eclipse.jface.tests.databinding/src/org/eclipse/jface/tests/databinding/BindingTestSuite.java
import org.eclipse.core.tests.internal.databinding.validation.NumberToUnboundedNumberValidatorTest;
import org.eclipse.core.tests.internal.databinding.validation.StringToByteValidatorTest;
import org.eclipse.core.tests.internal.databinding.validation.StringToCharacterValidatorTest;
import org.eclipse.core.tests.internal.databinding.validation.StringToDoubleValidatorTest;
import org.eclipse.core.tests.internal.databinding.validation.StringToFloatValidatorTest;
import org.eclipse.core.tests.internal.databinding.validation.StringToIntegerValidatorTest;
import org.eclipse.core.tests.internal.databinding.validation.StringToLongValidatorTest;
import org.eclipse.core.tests.internal.databinding.validation.StringToShortValidatorTest;
import org.eclipse.jface.tests.databinding.scenarios.BindingScenariosTestSuite;
import org.eclipse.jface.tests.databinding.swt.SWTObservablesTest;
import org.eclipse.jface.tests.databinding.viewers.ObservableListTreeContentProviderTest;
import org.eclipse.jface.tests.databinding.viewers.ObservableMapLabelProviderTest;
import org.eclipse.jface.tests.databinding.viewers.ObservableSetContentProviderTest;
import org.eclipse.jface.tests.databinding.viewers.ObservableSetTreeContentProviderTest;
import org.eclipse.jface.tests.databinding.viewers.ViewersObservablesTest;
import org.eclipse.jface.tests.examples.databinding.mask.internal.EditMaskLexerAndTokenTest;
import org.eclipse.jface.tests.examples.databinding.mask.internal.EditMaskParserTest;
import org.eclipse.jface.tests.internal.databinding.swt.ButtonObservableValueTest;
import org.eclipse.jface.tests.internal.databinding.swt.CComboObservableValueSelectionTest;
import org.eclipse.jface.tests.internal.databinding.swt.CComboObservableValueTest;
import org.eclipse.jface.tests.internal.databinding.swt.CComboObservableValueTextTest;
import org.eclipse.jface.tests.internal.databinding.swt.CComboSingleSelectionObservableValueTest;
import org.eclipse.jface.tests.internal.databinding.swt.CLabelObservableValueTest;
import org.eclipse.jface.tests.internal.databinding.swt.ComboObservableValueSelectionTest;
import org.eclipse.jface.tests.internal.databinding.swt.ComboObservableValueTest;
import org.eclipse.jface.tests.internal.databinding.swt.ComboObservableValueTextTest;
import org.eclipse.jface.tests.internal.databinding.swt.ComboSingleSelectionObservableValueTest;
import org.eclipse.jface.tests.internal.databinding.swt.ControlObservableValueTest;
import org.eclipse.jface.tests.internal.databinding.swt.DelayedObservableValueTest;
import org.eclipse.jface.tests.internal.databinding.swt.LabelObservableValueTest;