const QRect r(0, 0, width() - BaselineOffset, height());
const vector<shared_ptr<TraceTreeItem>> items(
view_.list_by_type<TraceTreeItem>());
const QRect r(0, 0, width() - BaselineOffset, height());
const vector<shared_ptr<TraceTreeItem>> items(
view_.list_by_type<TraceTreeItem>());