Bug 326175 WBWRenderer arbitrarily modifies the window's parent's active context chain
The window's parent's context arbitrarily changes its active child to the window being rendered in createWidget(*).
bundles/org.eclipse.e4.ui.workbench.renderers.swt/src/org/eclipse/e4/ui/workbench/renderers/swt/WBWRenderer.java
boundsJob = new WindowSizeUpdateJob();
						boundsJob.windowsToUpdate.add(windowModel);
						theShell.getDisplay().asyncExec(boundsJob);
					} else {
						if (!boundsJob.windowsToUpdate.contains(windowModel))
							boundsJob.windowsToUpdate.add(windowModel);
					}
				}
			}
		};
		eventBroker.subscribe(UIEvents.buildTopic(UIEvents.Window.TOPIC),
				sizeHandler);
	}
	@PreDestroy
	public void contextDisposed() {
		eventBroker.unsubscribe(shellUpdater);
		eventBroker.unsubscribe(visibilityHandler);
		eventBroker.unsubscribe(sizeHandler);
	}
	public Object createWidget(MUIElement element, Object parent) {
		final Widget newWidget;
		if (!(element instanceof MWindow)
				|| (parent != null && !(parent instanceof Control)))
			return null;
		MWindow wbwModel = (MWindow) element;
		Shell parentShell = parent == null ? null : ((Control) parent)
				.getShell();
		final Shell wbwShell;
		if (parentShell == null) {
			wbwShell = new Shell(Display.getCurrent(), SWT.SHELL_TRIM);