Bug 129812 [Markers] Enabling problem categorization per default
Build 3.2M5 Recent progress on problem categorization should be made more proeminent by enabling categorization by default. Similar to search view doing hierarchical presentation by default nowadays.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/views/markers/internal/MarkerView.java
void setFilters(MarkerFilter[] newFilters) {
		markerFilters = newFilters;
	}
	/**
	 * Clear the cache of enabled filters.
	 * 
	 */
	void clearEnabledFilters() {
		enabledFilters = null;
	}
	/**
	 * Refresh the contents of the filter sub menu.
	 */
	private void refreshFilterMenu() {
		if (filtersMenu == null) {
			return;
		}
		filtersMenu.removeAll();
		MarkerFilter[] filters = getAllFilters();
		for (int i = 0; i < filters.length; i++) {
			filtersMenu.add(new FilterEnablementAction(filters[i], this));
		}
	}
	/**
	 * Open a filter dialog on the receiver.
	 */
	protected abstract DialogMarkerFilter createFiltersDialog();
	/**
	 * Given a selection of IMarker, reveals the corresponding elements in the
	 * viewer