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
addTest(CLabelObservableValueTest.suite());
		addTestSuite(ComboObservableValueTest.class);
		addTest(ComboObservableValueSelectionTest.suite());
		addTest(ComboObservableValueTextTest.suite());
		addTestSuite(ComboSingleSelectionObservableValueTest.class);
		addTest(DelayedObservableValueTest.suite());
		
		addTest(SWTObservableListTest.suite());
		
		addTestSuite(ControlObservableValueTest.class);
		addTest(LabelObservableValueTest.suite());
		addTestSuite(ListSingleSelectionObservableValueTest.class);
		addTest(ScaleObservableValueMinTest.suite());
		addTest(ScaleObservableValueMaxTest.suite());
		addTest(ScaleObservableValueSelectionTest.suite());
		
		addTest(ShellObservableValueTest.suite());
		
		addTestSuite(SpinnerObservableValueTest.class);
		addTest(SpinnerObservableValueMinTest.suite());
		addTest(SpinnerObservableValueMaxTest.suite());
		addTest(SpinnerObservableValueSelectionTest.suite());
		
		addTestSuite(TableObservableValueTest.class);
		addTest(TableSingleSelectionObservableValueTest.suite());
		addTest(TextEditableObservableValueTest.suite());
		addTest(TextObservableValueFocusOutTest.suite());
		addTest(TextObservableValueModifyTest.suite());
		addTestSuite(TextObservableValueTest.class);