Bug 322356 EPS's isPartVisible(MPart) method does not consider placeholders
SSIA
tests/org.eclipse.e4.ui.tests/src/org/eclipse/e4/ui/tests/application/HeadlessContextPresentationEngine.java
}
		}
		if (element instanceof MContext) {
			MContext mcontext = (MContext) element;
			IEclipseContext context = mcontext.getContext();
			mcontext.setContext(null);
			if (context instanceof IDisposable) {
				((IDisposable) context).dispose();
			}
		}
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see
	 * org.eclipse.e4.ui.workbench.IPresentationEngine#run(org.eclipse.e4.ui
	 * .model.application.MApplicationElement)
	 */
	public Object run(MApplicationElement uiRoot, IEclipseContext appContext) {
		return 0;
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.e4.ui.workbench.IPresentationEngine#stop()
	 */
	public void stop() {
	}
}