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.
bundles/org.eclipse.core.databinding/src/org/eclipse/core/internal/databinding/ValueBinding.java
/**
	 * Can be called from any thread/realm.
	 */
	public void updateTargetFromModel() {
		updateTargetFromModel(BindingEvent.PIPELINE_AFTER_CHANGE);
	}
	/**
	 * Perform the model to target process up to and including the
	 * <code>lastPosition</code>.
	 * 
	 * @param diff
	 * @param lastPosition
	 *            BindingEvent.PIPELINE_* constant
	 */
	private void doUpdateTargetFromModel(ValueDiff diff, int lastPosition) {
		Assert.isTrue(target.getRealm().isCurrent());
		try {
			updatingTarget = true;
			BindingEvent e = createBindingEvent(diff,
					BindingEvent.EVENT_COPY_TO_TARGET, BindingEvent.PIPELINE_AFTER_GET);
			e.originalValue = diff.getNewValue();
			if (!performPosition(e.originalValue,
					BindingEvent.PIPELINE_AFTER_GET, e, lastPosition)) {
				return;
			}
			e.convertedValue = modelToTargetConverter.convert(e.originalValue);
			if (!performPosition(e.convertedValue,
					BindingEvent.PIPELINE_AFTER_CONVERT, e, lastPosition)) {
				return;
			}