Bug 336225 Trim bars do not get unrendered by the rendering engine when trimmed window is unrendered
The trim bars are "ignored" by the rendering engine as it does not perform an unrendering pass on them when the parent trimmed window is being unrendered.
bundles/org.eclipse.e4.ui.workbench.swt/src/org/eclipse/e4/ui/internal/workbench/swt/PartRenderingEngine.java
return limbo;
	}
	/**
	 * @param element
	 */
	public void removeGui(final MUIElement element) {
		
		
		SafeRunner.run(new ISafeRunnable() {
			public void handleException(Throwable e) {
				if (e instanceof Error) {
					
					throw (Error) e;
				} else {
					
					if (logger != null) {
						String message = "Exception occurred while unrendering: {0}"; 
						logger.error(e, NLS.bind(message, element));
					}
				}
			}
			public void run() throws Exception {
				safeRemoveGui(element);
			}
		});
	}
	private void safeRemoveGui(MUIElement element) {
		if (removeRoot == null)
			removeRoot = element;
		renderedElements.remove(element);