Bug 203974 [Markers] [Markers] markers view: Twistis on configure filter dialog not correctly laid out
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/provisional/views/markers/FiltersConfigurationDialog.java
}
	/**
	 * Create a new filter called newName
	 * 
	 * @param newName
	 */
	protected void createNewFilter(String newName) {
		MarkerFieldFilterGroup group = new MarkerFieldFilterGroup(null,
				contentGenerator);
		group.setName(newName);
		filterGroups.add(group);
		filtersList.refresh();
		filtersList.setSelection(new StructuredSelection(group));
	}
	/**
	 * Return the filter groups modified by the receiver.
	 * 
	 * @return Collection of {@link MarkerFieldFilterGroup}
	 */
	public Collection getFilters() {
		return filterGroups;
	}
	/**
	 * Make a working copy of the groups.
	 * 
	 * @param groups
	 * @return Collection of MarkerFieldFilterGroup
	 */
	private Collection makeWorkingCopy(Collection groups) {
		Iterator initialFiltersIterator = groups.iterator();