Function applyTableRadioColumn

pj_dialog_host/src/widget_binding.cpp:182–226

Render `col` of `tw` as an exclusive radio group (one QRadioButton per row), check `checked_row`, and wire each radio's click to emit_row(its current row). Idempotent: reuses existing radios and only syncs the checked state, so it can run on every data apply without flicker. Rows that shrink away have their cell widgets destroyed by QTableWidget::setRowCount, which auto-removes them from the QButt

// QButtonGroup. `clicked` fires on user interaction only (NOT on setChecked), so
// the checked-state sync below never feeds back as a spurious event.
static void applyTableRadioColumn(
    QTableWidget* tw, int col, int checked_row, const std::function<void(int)>& emit_row) {
  if (col < 0 || col >= tw->columnCount()) {
    return;
  }
  auto* group = tw->findChild<QButtonGroup*>(QStringLiteral("pj_radio_group"), Qt::FindDirectChildrenOnly);
  if (group == nullptr) {
    group = new QButtonGroup(tw);
    group->setObjectName(QStringLiteral("pj_radio_group"));
    group->setExclusive(true);
  }
  for (int r = 0; r < tw->rowCount(); ++r) {
    auto* radio = qobject_cast<QRadioButton*>(tw->cellWidget(r, col));
    if (radio == nullptr) {
      radio = new QRadioButton(tw);
      radio->setStyleSheet(QStringLiteral("QRadioButton { margin-left: 8px; }"));
      tw->setCellWidget(r, col, radio);
      group->addButton(radio);
      // Resolve the row at click time: rows renumber as the user adds/removes
      // series, so a row index captured at creation would go stale.
      QObject::connect(radio, &QRadioButton::clicked, radio, [emit_row, tw, col, radio]() {
        for (int rr = 0; rr < tw->rowCount(); ++rr) {
          if (tw->cellWidget(rr, col) == radio) {
            emit_row(rr);
            return;
          }
        }
      });
    }
    radio->setChecked(r == checked_row);
  }

  // Keep the radio column just wide enough for the button, and stretch the first
  // non-radio column instead. installTreeLikeHeader stretches column 0 by default,
  // which would over-widen the radio when it is the first column.
  auto* header = tw->horizontalHeader();
  header->setSectionResizeMode(col, QHeaderView::Fixed);
  tw->setColumnWidth(col, 36);
  for (int c = 0; c < tw->columnCount(); ++c) {
    if (c != col) {
      header->setSectionResizeMode(c, QHeaderView::Stretch);
      break;
    }
  }
}

// True when `tw`'s header labels already equal `headers`.
static bool tableMatchesHeaders(const QTableWidget* tw, const QStringList& headers) {