Merge 122552 - REGRESSION(r119948): [Forms] Spin button Up/Down actions make value to zero for inpu…

Source/WebCore/platform/Decimal.cpp

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 610 matching lines @@
     if (isSpecial())
         return *this;
 
     if (exponent() >= 0)
         return *this;
 
     uint64_t result = m_data.coefficient();
     const int numberOfDigits = countDigits(result);
     const int numberOfDropDigits = -exponent();
     if (numberOfDigits < numberOfDropDigits)
-        return zero(Positive);
+        return isPositive() ? Decimal(1) : zero(Positive);
 
     result = scaleDown(result, numberOfDropDigits - 1);
     if (sign() == Positive && result % 10 > 0)
         result += 10;
     result /= 10;
     return Decimal(sign(), 0, result);
 }
 
 Decimal Decimal::compareTo(const Decimal& rhs) const
 {
@@ skipping 21 matching lines @@
     if (isSpecial())
         return *this;
 
     if (exponent() >= 0)
         return *this;
 
     uint64_t result = m_data.coefficient();
     const int numberOfDigits = countDigits(result);
     const int numberOfDropDigits = -exponent();
     if (numberOfDigits < numberOfDropDigits)
-        return zero(Positive);
+        return isPositive() ? zero(Positive) : Decimal(-1);
 
     result = scaleDown(result, numberOfDropDigits - 1);
     if (isNegative() && result % 10 > 0)
         result += 10;
     result /= 10;
     return Decimal(sign(), 0, result);
 }
 
 Decimal Decimal::fromDouble(double doubleValue)
 {
@@ skipping 342 matching lines @@
     }
     return builder.toString();
 }
 
 Decimal Decimal::zero(Sign sign)
 {
     return Decimal(EncodedData(sign, EncodedData::ClassZero));
 }
 
 } // namespace WebCore