Bug 275018 [Markers] Problems View / Configure Contents dialog should support rename
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/views/markers/FiltersConfigurationDialog.java
MarkerMessages.MarkerFilter_newFilterName,
				new IInputValidator() {
					public String isValid(String newText) {
						if (newText.length() == 0)
							return MarkerMessages.MarkerFilterDialog_emptyMessage;
						Iterator filterIterator = filterGroups
								.iterator();
						while (filterIterator.hasNext()) {
							if (((MarkerFieldFilterGroup) filterIterator
									.next()).getName().equals(newText))
								return NLS
										.bind(
												MarkerMessages.filtersDialog_conflictingName,
												newText);
						}
						return null;
					}
				});
		if (Window.OK == newDialog.open()) {
			String newName = newDialog.getValue();
			if (newName != null) {
				createNewFilter(newName,cloneSelected);
			}
		}
	}
	/**
	 * Create a new filterGroup, and adds it to the filterGroups 
	 * @param cloneSelected true clones the selected filterGroup
	 * @param newName name of new filterGroup
	 */