Bug 270457 [Viewers] [regression] CheckBoxTreeViewer clears check state after collapseAll
Hi there :) In my RCP I've a CheckBoxTreeViewer that looses check states for invisible items. Turns out if a disable the collapseAll() call things go back to normal. So, in a tree like this: [x] root [x] sub a collapseAll expandAll will create this: [x] root [] sub Could still be my fault, feel free to have me try some workarounds or other tests that help you find the cause...
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/AbstractTreeViewer.java
if (parent != null) {
				Widget pw = internalExpand(parent, false);
				if (pw != null) {
					
					createChildren(pw);
					Object element = internalToElement(elementOrPath);
					w = internalFindChild(pw, element);
					if (expand && pw instanceof Item) {
						
						Item item = (Item) pw;
						LinkedList toExpandList = new LinkedList();
						while (item != null && !getExpanded(item)) {
							toExpandList.addFirst(item);
							item = getParentItem(item);
						}
						for (Iterator it = toExpandList.iterator(); it
								.hasNext();) {
							Item toExpand = (Item) it.next();
							setExpanded(toExpand, true);
						}
					}
				}
			}
		}
		return w;
	}
	/**
	 * If the argument is a tree path, returns its last segment, otherwise
	 * return the argument
	 *