Bug 174555 [DataBinding] Run validation on binding construction
When a binding is created the assumption is that the UI is synchronized with the model. This means that the UI should reflect the state of the model's validity as well. In order to ensure that the UI reflects the model's validity the consumer needs to force a copy to model on instantiation of every binding. We need to remove this requirement.
tests/org.eclipse.jface.tests.databinding/src/org/eclipse/jface/tests/internal/databinding/internal/viewers/SelectionProviderSingleSelectionObservableValueTest.java
* @see junit.framework.TestCase#setUp()
     */
    protected void setUp() throws Exception {
        Shell shell = new Shell();
        viewer = new TableViewer(shell, SWT.NONE);
        viewer.setContentProvider(new ContentProvider());
        viewer.setInput(model);
        selectionProvider = viewer;
    }
    /*
     * (non-Javadoc)
     * 
     * @see junit.framework.TestCase#tearDown()
     */
    protected void tearDown() throws Exception {
        Shell shell = viewer.getTable().getShell();
        if (!shell.isDisposed())
            shell.dispose();
    }
    public void testConstructorIllegalArgumentException() {
        try {
            new SelectionProviderSingleSelectionObservableValue(SWTObservables.getRealm(Display.getDefault()), null);
            fail();
        } catch (IllegalArgumentException e) {
        }
    }
    /**
     * Asserts that when a selection is set on the viewer:
     * <ul>
     * <li>the selection is available in the observable</li>