Bug 343003 Selection changes for shared parts may not be propagated if they were not originally rendered in the model
The search algorithm currently only iterates through containers for parts. This will not work for parts that are represented by placeholders.
bundles/org.eclipse.e4.ui.workbench/src/org/eclipse/e4/ui/internal/workbench/SelectionServiceImpl.java
* @see org.eclipse.e4.ui.selection.ESelectionService#removeSelectionListener(java.lang.String,
	 * org.eclipse.e4.ui.selection.ISelectionListener)
	 */
	public void removeSelectionListener(String partId, ISelectionListener listener) {
		
		if (context != null) {
			ListenerList listeners = targetedListeners.get(partId);
			if (listeners != null) {
				listeners.remove(listener);
			}
		}
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.e4.ui.selection.ESelectionService#getSelection(java.lang.String)
	 */
	public Object getSelection(String partId) {
		MPart part = partService.findPart(partId);
		if (part == null) {
			return null;
		}
		IEclipseContext partContext = part.getContext();
		if (partContext == null) {
			return null;
		}
		return partContext.get(OUT_SELECTION);
	}
}