Bug 309563 All packages (o.e.e4.ui.model.workbench.edit) of ItemProviders need to be exported
Before, there is only one ApplicationItemProviderAdapterFactory used by e4 Visual Designer. Now with the new model in multiple packages, we need to export all the corresponding ItemProvider.
bundles/org.eclipse.e4.ui.model.workbench.edit/src/org/eclipse/e4/ui/model/application/ui/basic/provider/PartItemProvider.java
@Override
	public Collection<? extends EStructuralFeature> getChildrenFeatures(Object object) {
		if (childrenFeatures == null) {
			super.getChildrenFeatures(object);
			childrenFeatures.add(UiPackageImpl.Literals.CONTEXT__PROPERTIES);
			childrenFeatures.add(CommandsPackageImpl.Literals.HANDLER_CONTAINER__HANDLERS);
			childrenFeatures.add(BasicPackageImpl.Literals.PART__MENUS);
			childrenFeatures.add(BasicPackageImpl.Literals.PART__TOOLBAR);
		}
		return childrenFeatures;
	}
	/**
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 */
	@Override
	protected EStructuralFeature getChildFeature(Object object, Object child) {
		
		
		return super.getChildFeature(object, child);
	}
	/**
	 * This returns Part.gif.
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 */
	@Override
	public Object getImage(Object object) {