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/MarkerSupportRegistry.java
}
		return ids;
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.core.runtime.dynamichelpers.IExtensionChangeHandler#addExtension(org.eclipse.core.runtime.dynamichelpers.IExtensionTracker,
	 *      org.eclipse.core.runtime.IExtension)
	 */
	public void addExtension(IExtensionTracker tracker, IExtension extension) {
		processExtension(tracker, extension);
	}
	/**
	 * Get the collection of currently registered filters.
	 * 
	 * @return Collection of ProblemFilter
	 */
	public Collection getRegisteredFilters() {
		Collection filteredFilters = new ArrayList();
		Iterator registeredIterator = registeredFilters.iterator();
		while (registeredIterator.hasNext()) {
			ProblemFilter next = (ProblemFilter) registeredIterator.next();
			if (next.isFilteredOutByActivity()) {
				continue;
			}
			filteredFilters.add(next);
		}
		return filteredFilters;
	}
	/**