Redondear un precio al tick size (no NormalizeDouble)

double RoundToTick(string symbol, double price)
{
   double tickSize = SymbolInfoDouble(symbol, SYMBOL_TRADE_TICK_SIZE);
   int    digits   = (int)SymbolInfoInteger(symbol, SYMBOL_DIGITS);

   if(tickSize <= 0.0)
      return NormalizeDouble(price, digits); // repli

   // Quantifier au multiple de tick le plus proche, PUIS normaliser
   double rounded = MathRound(price / tickSize) * tickSize;
   return NormalizeDouble(rounded, digits);
}

// Exemple : sur un future coté au quart de point
// RoundToTick(sym, 15123.37) -> 15123.25 (et non 15123.37)
double entry = RoundToTick(_Symbol, levelFromIndicator);