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
Object element = treePath.getLastSegment();
				if (element != null) {
					w = internalExpand(element, false);
					if (w instanceof Item) {
						newSelection.add(w);
					}
				}
			}
		}
		setSelection(newSelection);
		
		
		
		
		if (reveal && newSelection.size() > 0) {
			
			
			for (int i = (newSelection.size()-1); i >= 0; i--) {
				showItem((Item) newSelection.get(i));
			}
		}
	}
	/**
	 * Shows the given item.
	 *
	 * @param item
	 *            the item
	 */
	protected abstract void showItem(Item item);
	/**