Bug 283178 [Compatibility] Make actionSets visible/invisible
Model elements generated from actionSets should be grouped so they can be made visible/invisible. PW
bundles/org.eclipse.e4.ui.workbench.renderers.swt/src/org/eclipse/e4/workbench/ui/renderers/swt/HandledContributionItem.java
* .ToolBar, int)
	 */
	@Override
	public void fill(ToolBar parent, int index) {
		if (model == null) {
			return;
		}
		if (widget != null) {
			return;
		}
		int style = SWT.PUSH;
		ToolItem item = null;
		if (index >= 0) {
			item = new ToolItem(parent, style, index);
		} else {
			item = new ToolItem(parent, style);
		}
		item.setData(this);
		item.addListener(SWT.Dispose, getItemListener());
		item.addListener(SWT.Selection, getItemListener());
		widget = item;
		update(null);
		updateIcons();
		addModelListener();
		widget.getDisplay().timerExec(VISIBLE_ITEM_REFRESH, new Runnable() {
			public void run() {
				if (widget == null || widget.isDisposed()) {
					return;
				}
				ToolItem item = (ToolItem) widget;