Bug 304870 [Compatibility] Cannot show view after performing DND
1. Drag the 'Problems' view to another position in the bottom stack. 2. Window > Show View > History 3. Nothing happens.
bundles/org.eclipse.e4.ui.workbench.swt/src/org/eclipse/e4/ui/workbench/swt/internal/E4Application.java
.getLocal(IContextConstants.ACTIVE_CHILD);
				}
				Object object = current.get(MPerspective.class.getName());
				return object == null ? current.get(MWindow.class.getName())
						: object;
			}
		});
		
		
		appContext.set(IExceptionHandler.class.getName(), exceptionHandler);
		appContext.set(IExtensionRegistry.class.getName(), registry);