Bug 329310 Part service does not autogenerate stacks if the last container is not one
tests/org.eclipse.e4.ui.tests/src/org/eclipse/e4/ui/tests/application/EPartServiceTest.java
window.getSharedElements().add(partA);
		MPart partB = BasicFactoryImpl.eINSTANCE.createPart();
		window.getSharedElements().add(partB);
		MPart partC = BasicFactoryImpl.eINSTANCE.createPart();
		window.getSharedElements().add(partC);
		MPerspectiveStack perspectiveStack = AdvancedFactoryImpl.eINSTANCE
				.createPerspectiveStack();
		window.getChildren().add(perspectiveStack);
		window.setSelectedElement(perspectiveStack);
		MPerspective perspectiveA = AdvancedFactoryImpl.eINSTANCE
				.createPerspective();
		perspectiveStack.getChildren().add(perspectiveA);
		perspectiveStack.setSelectedElement(perspectiveA);
		MPlaceholder placeholderA1 = AdvancedFactoryImpl.eINSTANCE
				.createPlaceholder();
		placeholderA1.setRef(partA);
		partA.setCurSharedRef(placeholderA1);
		perspectiveA.getChildren().add(placeholderA1);
		perspectiveA.setSelectedElement(placeholderA1);
		MPlaceholder placeholderB1 = AdvancedFactoryImpl.eINSTANCE
				.createPlaceholder();
		placeholderB1.setRef(partB);
		partB.setCurSharedRef(placeholderB1);
		perspectiveA.getChildren().add(placeholderB1);
		MPlaceholder placeholderC1 = AdvancedFactoryImpl.eINSTANCE
				.createPlaceholder();
		placeholderC1.setRef(partC);
		partC.setCurSharedRef(placeholderC1);
		perspectiveA.getChildren().add(placeholderC1);
		MPerspective perspectiveB = AdvancedFactoryImpl.eINSTANCE