private void moveFocusTo(int row, int col) {
// update combination list if new group is selected
Cell cell = board.getCell(row, col);
int groupId = cell.getGroupId();
if (groupId != board.getCurrentCell().getGroupId()) {
combinationView.update(board.getGroup(groupId));
}
// don't update current cell before checking group ID changed
board.setCurrentCell(row, col);
boardView.focusOn(row, col);
}
