docs: @Override
  	protected ImageDescriptor imageDescriptor(Object element) {
  		if (this.imageDescriptorLock.isLocked()) {
  			return super.imageDescriptor(element);
  		}
  		this.imageDescriptorLock.lock();
  		try {
  			return doGetImageDescriptor(element);
  		} finally {
  			this.imageDescriptorLock.unlock();
  		}
  	}