docs: protected void moveSelectionTop() {
  		final IStructuredSelection selection = this.list.getStructuredSelection();
  		final int index = this.conversions.indexOf(selection.getFirstElement());
  		if (index > 0) {
  			final int endIndex = index + selection.size() - 1;
  			for (int i = 0; i < selection.size(); ++i) {
  				final ConversionMapping next = this.conversions.remove(endIndex);
  				this.conversions.addFirst(next);
  			}
  			refreshListUI();
  			this.list.refresh(true);
  			enableButtons();
  			preferenceValueChanged();
  		}
  	}