Bug 127519 [Markers] Disabling all filters gives empty list
If you disable (uncheck) the 'Default' filter then the result seems to be that -everything- gets filtered. This seems most unintuitive...I'd think that if I don't have any filters enabled then I should see an 'unfiltered' list.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/views/markers/internal/MarkerAdapter.java
* @param endIndex
		 */
		MarkerCategory(MarkerAdapter adapter, int startIndex, int endIndex,
				String categoryName) {
			markerAdapter = adapter;
			start = startIndex;
			end = endIndex;
			name = categoryName;
		}
		/*
		 * (non-Javadoc)
		 * 
		 * @see org.eclipse.ui.views.markers.internal.MarkerNode#getChildren()
		 */
		public MarkerNode[] getChildren() {
			if (children == null) {
				
				
				if (building) {
					return Util.EMPTY_MARKER_ARRAY;
				}
				ConcreteMarker[] allMarkers = markerAdapter.lastMarkers
						.toArray();
				int totalSize = getDisplayedSize();
				children = new ConcreteMarker[totalSize];
				System.arraycopy(allMarkers, start, children, 0, totalSize);
				
				view.getTableSorter().sort(view.getViewer(), children);
				for (int i = 0; i < children.length; i++) {
					children[i].setCategory(this);