Bug 336139 NPE thrown when trying to render a trim with unidentified elements
java.lang.NullPointerException at org.eclipse.e4.ui.workbench.renderers.swt.TrimBarLayout.isStatusLine(TrimBarLayout.java:245) at org.eclipse.e4.ui.workbench.renderers.swt.TrimBarLayout.computeSize(TrimBarLayout.java:146) at org.eclipse.e4.ui.workbench.renderers.swt.TrimBarLayout.access$0(TrimBarLayout.java:142) at org.eclipse.e4.ui.workbench.renderers.swt.TrimBarLayout$TrimLine.addControl(TrimBarLayout.java:36) at org.eclipse.e4.ui.workbench.renderers.swt.TrimBarLayout.computeSize(TrimBarLayout.java:104) at org.eclipse.swt.widgets.Composite.computeSize(Composite.java:233) at org.eclipse.e4.ui.workbench.renderers.swt.TrimmedPartLayout.layout(TrimmedPartLayout.java:120) at org.eclipse.swt.widgets.Composite.updateLayout(Composite.java:1263) at org.eclipse.swt.widgets.Composite.updateLayout(Composite.java:1249) at org.eclipse.swt.widgets.Composite.layout(Composite.java:664) at org.eclipse.swt.widgets.Composite.layout(Composite.java:622) at org.eclipse.e4.ui.workbench.renderers.swt.WBWRenderer.postProcess(WBWRenderer.java:585)
tests/org.eclipse.e4.ui.tests/src/org/eclipse/e4/ui/tests/workbench/PartRenderingEngineTests.java
application.getChildren().add(window);
		application.setContext(appContext);
		appContext.set(MApplication.class.getName(), application);
		wb = new E4Workbench(application, appContext);
		wb.createAndRunUI(window);
		MPart part = BasicFactoryImpl.eINSTANCE.createPart();
		part.setContributionURI("platform:/plugin/org.eclipse.e4.ui.tests/org.eclipse.e4.ui.tests.workbench.SampleView");
		window.getChildren().add(part);
		IPresentationEngine renderer = (IPresentationEngine) appContext
				.get(IPresentationEngine.class.getName());
		renderer.createGui(part);
		renderer.removeGui(part);
		while (Display.getCurrent().readAndDispatch()) {
			
		}
	}
	public void testRemoveGuiBug307578() {
		MApplication application = ApplicationFactoryImpl.eINSTANCE
				.createApplication();
		final MWindow window = BasicFactoryImpl.eINSTANCE.createWindow();
		application.getChildren().add(window);
		application.setSelectedElement(window);
		
		MPartStack stack = BasicFactoryImpl.eINSTANCE.createPartStack();
		window.getChildren().add(stack);
		window.setSelectedElement(stack);
		
		MPart partA = BasicFactoryImpl.eINSTANCE.createPart();
		partA.setContributionURI("platform:/plugin/org.eclipse.e4.ui.tests/org.eclipse.e4.ui.tests.workbench.SampleView");
		stack.getChildren().add(partA);