Bug 56818 [PropertiesView] Clicking on Advanced Properties toggle when categories are collapsed removes the + next to the category
Clicking on Advanced Properties toggle when categories are collapsed removes the plus sign (+) next to the category and it can no longer be expanded. To reproduce: 1.)Open the Properties view. 2.)Have Show Categories turned on, and Show Advanced Properties turned off. 3.)Collapse all open categories. 4.)Click the Show Advanced Properties button. 5.)Note the plus sign goes away and the categories can no longer be expanded. You need to click the Show Advanced Properties button off to see the plus sign again.
bundles/org.eclipse.ui.views/src/org/eclipse/ui/views/properties/PropertySheetViewer.java
item.setText(1, ""); 
		
		if (category.getAutoExpand()) {
			
			createChildren(item);
			item.setExpanded(true);
			category.setAutoExpand(false);
		} else {
			
			
			updatePlus(category, item);
		}
	}
	/**
	 * Update the child entries or categories of the given entry or category. If
	 * the given node is the root entry and we are showing categories then the
	 * child entries are categories, otherwise they are entries.
	 * 
	 * @param node
	 *            the entry or category whose children we will update
	 * @param widget
	 *            the widget for the given entry, either a
	 *            <code>TableTree</code> if the node is the root node or a
	 *            <code>TableTreeItem</code> otherwise.
	 */
	private void updateChildrenOf(Object node, Widget widget) {
		
		IPropertySheetEntry entry = null;
		PropertySheetCategory category = null;
		if (node instanceof IPropertySheetEntry)