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
* reflect the model. This method only affects the viewer, not the model.
	 * </p>
	 *
	 * @param parentElementOrTreePath
	 *            the parent element
	 * @param childElements
	 *            the child elements to add
	 */
	public void add(Object parentElementOrTreePath, Object[] childElements) {
		Assert.isNotNull(parentElementOrTreePath);
		assertElementsNotNull(childElements);
		if (checkBusy())
			return;
		Widget[] widgets = internalFindItems(parentElementOrTreePath);
		
		if (widgets.length == 0) {
			return;
		}
		for (int i = 0; i < widgets.length; i++) {
			internalAdd(widgets[i], parentElementOrTreePath, childElements);
		}
	}
	/**
	 * Find the items for the given element of tree path
	 *
	 * @param parentElementOrTreePath
	 *            the element or tree path
	 * @return the items for that element
	 *
	 * @since 3.3