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
class MarkerCategory extends MarkerNode {
		MarkerAdapter markerAdapter;
		int start;
		int end;
		private ConcreteMarker[] children;
		private String name;
		/**
		 * Create a new instance of the receiver that has the markers between
		 * startIndex and endIndex showing.
		 * 
		 * @param adapter
		 * @param startIndex