Bug 213040 [Markers] Selected filters not being kept on restart
When I select "Warnings on Selection" and then restart it is not selected when I come back in. We need to retain these selections. Note this is only a problem when selecting from the menu - from the dialog works fine.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/provisional/views/markers/MarkerContentGenerator.java
.getInstance()
					.getMarkerGroup(
							children[i]
									.getAttribute(MarkerSupportConstants.ATTRIBUTE_ID));
			
			if (group == null) {
				StatusManager
						.getManager()
						.handle(
								new Status(
										IStatus.ERROR,
										configurationElement
												.getDeclaringExtension()
												.getNamespaceIdentifier(),
										NLS
												.bind(
														MarkerMessages.ContentGenerator_NoGrouping,
														new Object[] {
																children[i]
																		.getAttribute(MarkerSupportConstants.ATTRIBUTE_ID),
																configurationElement
																		.getAttribute(MarkerSupportConstants.ATTRIBUTE_ID) })),
								StatusManager.LOG);
			} else
				groups.add(group);
		}
	}
	/**
	 * Add the resources in resourceMapping to the resourceCollection
	 *