message: GUI: Define MAX_DIGITS_BTC for magic number in BitcoinUnits::format
diff: #include <cassert>
  +static constexpr auto MAX_DIGITS_BTC = 16;
  +
  BitcoinUnits::BitcoinUnits(QObject *parent):
  QAbstractListModel(parent),
  unitlist(availableUnits())
  @@ -108,7 +110,9 @@ QString BitcoinUnits::format(int unit, const CAmount& nIn, bool fPlus, Separator
  qint64 n_abs = (n > 0 ? n : -n);
  qint64 quotient = n_abs / coin;
  QString quotient_str = QString::number(quotient);
  - if (justify) quotient_str = quotient_str.rightJustified(16 - num_decimals, ' ');
  + if (justify) {
  + quotient_str = quotient_str.rightJustified(MAX_DIGITS_BTC - num_decimals, ' ');
  + }
  // Use SI-style thin space separators as these are locale independent and can't be
  // confused with the decimal marker.
  