Bug 120691 [Markers] Expanded categories not persisted between sessions
build I20051213 - in the Problems view in hierarchical mode, with many problems showing, - expand a few categories, select some leaf problems - shutdown / restart - the tree is collapsed Users will expect that the work they did to expand/collapse categories to see the problems they care most about will be persisted between sessions.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/views/markers/ExtendedMarkersView.java
new Status(IStatus.WARNING, IDEWorkbenchPlugin.IDE_WORKBENCH,
						NLS.bind("Invalid markerContentGenerator {0} ", 
								id)));
	}
	/**
	 * Return whether or not group is enabled.
	 * 
	 * @param group
	 * @return boolean
	 */
	boolean isEnabled(MarkerFieldFilterGroup group) {
		return builder.getEnabledFilters().contains(group);
	}
	/**
	 * Return the main sort field for the receiver.
	 * 
	 * @return {@link MarkerField}
	 */
	boolean isPrimarySortField(MarkerField field) {
		return builder.getPrimarySortField().equals(field);
	}
	/**
	 * Return whether or not generator is the selected one.
	 * 
	 * @param generator
	 * @return boolean
	 */
	boolean isShowing(MarkerContentGenerator generator) {
		return this.builder.getGenerator().equals(generator);
	}