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
/*
			 * (non-Javadoc)
			 * 
			 * @see org.eclipse.ui.IPartListener2#partDeactivated(org.eclipse.ui.IWorkbenchPartReference)
			 */
			public void partDeactivated(IWorkbenchPartReference partRef) {
				
			}
			/*
			 * (non-Javadoc)
			 * 
			 * @see org.eclipse.ui.IPartListener2#partHidden(org.eclipse.ui.IWorkbenchPartReference)
			 */
			public void partHidden(IWorkbenchPartReference partRef) {
				
			}
			/*
			 * (non-Javadoc)
			 * 
			 * @see org.eclipse.ui.IPartListener2#partInputChanged(org.eclipse.ui.IWorkbenchPartReference)
			 */
			public void partInputChanged(IWorkbenchPartReference partRef) {
				
			}
			/*
			 * (non-Javadoc)
			 * 
			 * @see org.eclipse.ui.IPartListener2#partOpened(org.eclipse.ui.IWorkbenchPartReference)
			 */
			public void partOpened(IWorkbenchPartReference partRef) {