Bug 334559 EPartService's part searching path may not include parts outside of the active perspective
tests/org.eclipse.e4.ui.tests/src/org/eclipse/e4/ui/tests/application/EPartServiceTest.java
partB.setCurSharedRef(placeholderB2);
		perspectiveB.getChildren().add(placeholderB2);
		MPlaceholder placeholderC2 = AdvancedFactoryImpl.eINSTANCE
				.createPlaceholder();
		placeholderC2.setRef(partC);
		perspectiveB.getChildren().add(placeholderC2);
		initialize(applicationContext, application);
		getEngine().createGui(window);
		EPartService partService = window.getContext().get(EPartService.class);
		partService.activate(partC);
		perspectiveStack.setSelectedElement(perspectiveB);
		perspectiveB.getContext().activate();
		partService.activate(partA);
		partService.activate(partB);
		perspectiveStack.setSelectedElement(perspectiveA);
		perspectiveA.getContext().activate();
		partService.activate(partC);
		partService.hidePart(partC);
		perspectiveStack.setSelectedElement(perspectiveB);
		perspectiveB.getContext().activate();
		partService.hidePart(partB);
		assertEquals(partC, partService.getActivePart());
	}
	/**
	 * Tests that a perspective will automatically select another part as the
	 * active part after the originally active part that's being shown across
	 * multiple perspectives has been removed.
	 */
	public void testHidePart_ActivationHistory15() {
		MApplication application = ApplicationFactoryImpl.eINSTANCE