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
CustomHashtable expanded = newHashtable(CustomHashtable.DEFAULT_CAPACITY); 
																					
																					
																					
																					
		for (int i = 0; i < items.length; ++i) {
			if (getExpanded(items[i])) {
				Object element = items[i].getData();
				if (element != null) {
					expanded.put(element, element);
				}
			}
		}
		int min = Math.min(elementChildren.length, items.length);
		
		
		int numItemsToDispose = items.length - min;
		if (numItemsToDispose > 0) {
			CustomHashtable children = newHashtable(elementChildren.length * 2);
			for (int i = 0; i < elementChildren.length; i++) {
				Object elementChild = elementChildren[i];
				children.put(elementChild, elementChild);
			}
			int i = 0;
			while (numItemsToDispose > 0 && i < items.length) {
				Object data = items[i].getData();
				if (data == null || items.length - i <= numItemsToDispose || !children.containsKey(data)) {
					if (data != null) {