Bug 205923 [Viewers] Javadoc for setAllChecked() does not mention that only visible items are checked
setAllChecked which was added (by me) in 3.2 does not mention that all chidren must be visible for it to be checked (see setSubtreeChecked). We will have to leave it as it is API and does not expand the tree but I think we should deprecate it as setSubtreeChecked is really the only useful one. Boris what is your opinion?
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/CheckboxTreeViewer.java
}
    /**
     * Gathers the checked 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 internalCollectChecked(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).getChecked()) {
                Object data = item.getData();
                if (data != null) {
					result.add(data);
				}
            }
            internalCollectChecked(result, item);
        }
    }
    /**
     * 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);