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
if (entry == rootEntry && isShowingCategories) {
			if (categories.length > 1
					|| (categories.length == 1 && !categories[0]
							.getCategoryName().equals(
									MISCELLANEOUS_CATEGORY_NAME)))
				return Arrays.asList(categories);
		}
		
		return getFilteredEntries(entry.getChildEntries());
	}
	/**
	 * Returns the child entries of the given category
	 * 
	 * @return the children of the given category (element type
	 *         <code>IPropertySheetEntry</code>)
	 */
	private List getChildren(PropertySheetCategory category) {
		return getFilteredEntries(category.getChildEntries());
	}
	/*
	 * (non-Javadoc) Method declared on Viewer.
	 */
	public Control getControl() {
		return tableTree;
	}
	/**
	 * Returns the entries which match the current filter.
	 *
	 * @entries the entries to filter
	 * @return the entries which match the current filter