Function isValueOnlyItem

pj_widgets/src/CurveTreeView.cpp:161–163

A value-only leaf (string field): has a Value cell but is excluded from drags.

// A value-only leaf (string field): has a Value cell but is excluded from drags.
bool isValueOnlyItem(const QTreeWidgetItem* item) {
  return item != nullptr && item->data(kNameColumn, kValueOnlyRole).toBool();
}

// Flags for a curve leaf. A draggable leaf is a normal drag source; a value-only
// leaf (string field) stays selectable/highlightable but is never dragged and is