$tree->append('links', new ContentProvider('commit', 'tree_changed_links_diff', $link_placeholders));
$tree->append('links', new ContentProvider('commit', 'tree_changed_links', $link_placeholders));
break;
$tree->append('links', new ContentProvider('commit', 'tree_changed_links_diff', $link_placeholders));
$tree->append('links', new ContentProvider('commit', 'tree_changed_links', $link_placeholders));
break;