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
*            the widget
	 */
	protected void createChildren(final Widget widget) {
		boolean oldBusy = isBusy();
		setBusy(true);
		try {
			final Item[] tis = getChildren(widget);
			if (tis != null && tis.length > 0) {
				Object data = tis[0].getData();
				if (data != null) {
					return; 
				}
			}
			BusyIndicator.showWhile(widget.getDisplay(), new Runnable() {
				public void run() {
					
					
					if (tis != null) {
						for (int i = 0; i < tis.length; i++) {
							if (tis[i].getData() != null) {
								disassociate(tis[i]);
								Assert.isTrue(tis[i].getData() == null,
										"Second or later child is non -null");
							}
							tis[i].dispose();
						}
					}
					Object d = widget.getData();
					if (d != null) {
						Object parentElement = d;