Ensure ResolveMagnitudeWeightFactor returns Fraction(100, 567) prior …

…to block v13

src/gridcoin/voting/poll.cpp

@@ -215,15 +215,20 @@ int64_t Poll::Expiration() const
     return m_timestamp + (m_duration_days * 86400);
 }
 
-Fraction Poll::ResolveMagnitudeWeightFactor() const
+Fraction Poll::ResolveMagnitudeWeightFactor(CBlockIndex *index) const
 {
     Fraction magnitude_weight_factor = Params().GetConsensus().DefaultMagnitudeWeightFactor;
 
-           // Find the current protocol entry value for Magnitude Weight Factor, if it exists.
+    // Before V13 magnitude weight factor is 1 / 5.67.
+    if (!IsV13Enabled(index->nHeight)) {
+        return Fraction(100, 567);
+    }
+
+    // Find the current protocol entry value for Magnitude Weight Factor, if it exists.
     ProtocolEntryOption protocol_entry = GetProtocolRegistry().TryLastBeforeTimestamp("magnitudeweightfactor", m_timestamp);
 
-           // If their is an entry prior or equal in timestemp to the start of the poll and it is active then set the magnitude weight
-           // factor to that value. If the last entry is not active (i.e. deleted), then leave at the default.
+    // If their is an entry prior or equal in timestemp to the start of the poll and it is active then set the magnitude weight
+    // factor to that value. If the last entry is not active (i.e. deleted), then leave at the default.
     if (protocol_entry != nullptr && protocol_entry->m_status == ProtocolEntryStatus::ACTIVE) {
         magnitude_weight_factor = Fraction().FromString(protocol_entry->m_value);
     }

src/gridcoin/voting/poll.h

@@ -512,9 +512,11 @@ class Poll
     //! \brief Fetch the applicable magnitude factor for the poll. This is the magnitude factor of the last entry in the
     //! protocol registry database that has a timestamp at or before the poll start timestamp.
     //!
+    //! \param index CBlockIndex of block containing poll transaction (poll start).
+    //!
     //! \return Fraction Magnitude factor expressed as a Fraction.
     //!
-    Fraction ResolveMagnitudeWeightFactor() const;
+    Fraction ResolveMagnitudeWeightFactor(CBlockIndex* index) const;
 
     //!
     //! \brief Get the set of possible answers to the poll.

src/gridcoin/voting/registry.cpp

@@ -353,7 +353,7 @@ PollOption PollReference::TryReadFromDisk(CTxDB& txdb) const
 
             // This is a critical initialization, because the magnitude weight factor is only stored
             // in memory and is not serialized.
-            payload.m_poll.m_magnitude_weight_factor = payload.m_poll.ResolveMagnitudeWeightFactor();
+            payload.m_poll.m_magnitude_weight_factor = payload.m_poll.ResolveMagnitudeWeightFactor(GetStartingBlockIndexPtr());
             m_magnitude_weight_factor = payload.m_poll.m_magnitude_weight_factor;
 
             LogPrint(BCLog::LogFlags::VOTE, "INFO: %s: reference.m_timestamp = %" PRId64 " , poll.m_timestamp = %" PRId64 " , "
@@ -1033,7 +1033,7 @@ void PollRegistry::AddPoll(const ContractContext& ctx) EXCLUSIVE_LOCKS_REQUIRED(
         poll_ref.m_type = payload->m_poll.m_type.Value();
         poll_ref.m_timestamp = ctx.m_tx.nTime;
         poll_ref.m_duration_days = payload->m_poll.m_duration_days;
-        poll_ref.m_magnitude_weight_factor = payload->m_poll.ResolveMagnitudeWeightFactor();
+        poll_ref.m_magnitude_weight_factor = payload->m_poll.ResolveMagnitudeWeightFactor(poll_ref.GetStartingBlockIndexPtr());
 
         m_latest_poll = &poll_ref;