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
return viewer.getInput();
	}
	/**
	 * Get all of the fields visible in the receiver.
	 * 
	 * @return MarkerField[]
	 */
	MarkerField[] getVisibleFields() {
		return builder.getVisibleFields();
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.ui.part.ViewPart#init(org.eclipse.ui.IViewSite,
	 *      org.eclipse.ui.IMemento)
	 */
	public void init(IViewSite site, IMemento memento) throws PartInitException {
		super.init(site, memento);
		MarkerContentGenerator generator = null;
		if (memento != null) {
			generator = MarkerSupportRegistry.getInstance().getGenerator(
					memento.getString(TAG_GENERATOR));
		}
		if (generator == null && defaultGeneratorIds.length > 0) {
			generator = MarkerSupportRegistry.getInstance().getGenerator(
					defaultGeneratorIds[0]);
			if (generator == null)
				logInvalidGenerator(defaultGeneratorIds[0]);
		}
		if (generator == null)