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/CheckboxTreeViewer.java
* Gathers the grayed states of the given widget and its
     * descendents, following a pre-order traversal of the tree.
     *
     * @param result a writable list of elements (element type: <code>Object</code>)
     * @param widget the widget
     */
    private void internalCollectGrayed(List result, Widget widget) {
        Item[] items = getChildren(widget);
        for (int i = 0; i < items.length; i++) {
            Item item = items[i];
            if (item instanceof TreeItem && ((TreeItem) item).getGrayed()) {
                Object data = item.getData();
                if (data != null) {
					result.add(data);
				}
            }
            internalCollectGrayed(result, item);
        }
    }
    /**
     * Sets the checked state of all items to correspond to the given set of checked elements.
     *
     * @param checkedElements the set (element type: <code>Object</code>) of elements which are checked
     * @param widget the widget
     */
    private void internalSetChecked(CustomHashtable checkedElements,
            Widget widget) {
        Item[] items = getChildren(widget);
        for (int i = 0; i < items.length; i++) {
            TreeItem item = (TreeItem) items[i];