OO-2103: do not render checkboxes on elements not accessible

src/main/java/org/olat/core/gui/components/tree/MenuTreeRenderer.java

@@ -325,7 +325,7 @@ public class MenuTreeRenderer extends DefaultComponentRenderer {
 		}
 		target.append("'>");
 		
-		if(tree.isMultiSelect() && tree.getMenuTreeItem() != null) {
+		if(tree.isMultiSelect() && tree.getMenuTreeItem() != null && curRoot.isAccessible()) {
 			renderCheckbox(target, curRoot, tree);
 		}