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
gc.setFont(tree.getFont());
				FontMetrics fontMetrics = gc.getFontMetrics();
				gc.dispose();
				columnWidth = Math.max(columnWidth, fontMetrics
						.getAverageCharWidth() * 5);
			}
			layout.addColumnData(new ColumnPixelData(columnWidth, true, true));
			TreeViewerColumn column;
			if (i < currentColumns.length)
				column = new TreeViewerColumn(viewer, currentColumns[i]);
			else {
				column = new TreeViewerColumn(viewer, SWT.NONE);
				column.getColumn().setResizable(true);
				column.getColumn().setMoveable(true);
				column.getColumn().addSelectionListener(getHeaderListener());
			}
			column.getColumn().setData(MARKER_FIELD, markerField);
			
			column.setLabelProvider(new MarkerColumnLabelProvider(markerField,
					i == 0));
			column.getColumn().setText(markerField.getColumnHeaderText());
			column.getColumn().setToolTipText(
					markerField.getColumnTooltipText());
			column.getColumn().setImage(markerField.getColumnHeaderImage());
			EditingSupport support = markerField.getEditingSupport(viewer);
			if (support != null)
				column.setEditingSupport(support);
			if (builder.getPrimarySortField().equals(markerField))
				updateDirectionIndicator(column.getColumn(), markerField);
		}