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 checked and grayed states of the given widget and its
     * descendents.
     *
     * @param checked a writable set of elements (element type: <code>Object</code>) 
     * @param grayed a writable set of elements (element type: <code>Object</code>) 
     * @param widget the widget
     */
    private void gatherState(CustomHashtable checked, CustomHashtable grayed,
            Widget widget) {
        Item[] items = getChildren(widget);
        for (int i = 0; i < items.length; i++) {
            Item item = items[i];
            if (item instanceof TreeItem) {
                Object data = item.getData();
                if (data != null) {
                    TreeItem ti = (TreeItem) item;
                    if (ti.getChecked()) {
						checked.put(data, data);
					}
                    if (ti.getGrayed()) {
						grayed.put(data, data);
					}
                }
            }
            gatherState(checked, grayed, item);