Bug 327026 [Compatibility] NPE thrown when reopening an editor after moving a view into the shared area
1. Open an editor. 2. Move the 'Problems' view into the shared area. 3. Close the 'Problems' view. 4. Close the editor. 5. Reopen the same file from step 1. 6. An NPE is thrown. java.lang.NullPointerException at org.eclipse.e4.ui.internal.workbench.PartServiceImpl.getParentWithContext(PartServiceImpl.java:224) at org.eclipse.e4.ui.internal.workbench.PartServiceImpl.internalFixContext(PartServiceImpl.java:272) at org.eclipse.e4.ui.internal.workbench.PartServiceImpl.bringToTop(PartServiceImpl.java:248) at org.eclipse.e4.ui.internal.workbench.PartServiceImpl.showPart(PartServiceImpl.java:742) at org.eclipse.e4.ui.internal.workbench.PartServiceImpl.showPart(PartServiceImpl.java:795) at org.eclipse.ui.internal.WorkbenchPage.busyOpenEditor(WorkbenchPage.java:2206) at org.eclipse.ui.internal.WorkbenchPage.access$14(WorkbenchPage.java:2173) at org.eclipse.ui.internal.WorkbenchPage$6.run(WorkbenchPage.java:2155) at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70) at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2151) at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2135) at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2126) at org.eclipse.ui.ide.IDE.openEditor(IDE.java:651) at org.eclipse.ui.ide.IDE.openEditor(IDE.java:610) at org.eclipse.jdt.internal.ui.javaeditor.EditorUtility.openInEditor(EditorUtility.java:354) at org.eclipse.jdt.internal.ui.javaeditor.EditorUtility.openInEditor(EditorUtility.java:164) at org.eclipse.jdt.ui.actions.OpenAction.run(OpenAction.java:219)
bundles/org.eclipse.e4.ui.workbench/src/org/eclipse/e4/ui/internal/workbench/PartServiceImpl.java
part.setCurSharedRef(placeholder);
			}
		}
	}
	private boolean isShared(MPart part) {
		return getWindow().getSharedElements().contains(part);
	}
	private void addToLastContainer(String category, MPart part) {
		MElementContainer<?> lastContainer = getLastContainer();
		MPlaceholder placeholder = part.getCurSharedRef();
		if (placeholder == null) {
			((List) lastContainer.getChildren()).add(part);
		} else {
			((List) lastContainer.getChildren()).add(placeholder);
		}
		if (category != null) {
			lastContainer.getTags().add(category);
		}
	}
	private MElementContainer<?> getLastContainer() {
		MElementContainer<MUIElement> searchRoot = getContainer();
		List<MUIElement> children = searchRoot.getChildren();
		if (children.size() == 0) {
			MPartStack stack = BasicFactoryImpl.eINSTANCE.createPartStack();
			searchRoot.getChildren().add(stack);
			return stack;
		}
		MElementContainer<?> lastContainer = getLastContainer(searchRoot, children);
		if (lastContainer == null) {
			MPartStack stack = BasicFactoryImpl.eINSTANCE.createPartStack();