Bug 203838 [Markers] [Markers] clicking on column headers does not sort table
I20070918 Clicking on any of the column headers does not sort based on the relevant column.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/provisional/views/markers/MarkerContentGenerator.java
*/
	private void findIntersection(Collection matching, Collection returnMarkers) {
		HashSet removeMarkers = new HashSet();
		Iterator existing = returnMarkers.iterator();
		while(existing.hasNext()){
			Object next = existing.next();
			if(matching.contains(next))
				continue;
			removeMarkers.add(next);
		}
		returnMarkers.removeAll(removeMarkers);
		
	}
	/**
	 * Get the all of the fields that this content generator is using.
	 * 
	 * @return {@link MarkerField}[]
	 */
	public MarkerField[] getAllFields() {
		return allFields;
	}
	/**
	 * Return all of the filters for the receiver.
	 * 
	 * @return Collection of MarkerFieldFilterGroup
	 */
	public Collection getAllFilters() {
		if (filters == null) {
			filters = new ArrayList();
			IConfigurationElement[] filterReferences = configurationElement