Correct last vote handling in poll card

The handling for last vote did not really work correctly in the case
where the walletholder votes multiple times. Because of the way the voting
system handles duplicate outputs in the vote tallying, the last vote only
does not necessarily contain the entire weight for the walletholder.

This commit implements showing the choices and the weight on each one..

src/gridcoin/voting/result.cpp

@@ -1248,7 +1248,11 @@ void PollResult::TallyVote(VoteDetail detail)
 
     if (detail.m_ismine != ISMINE_NO) {
         m_self_voted = true;
-        m_self_vote_detail = detail;
+
+        m_self_vote_detail.m_amount += detail.m_amount;
+        m_self_vote_detail.m_mining_id = detail.m_mining_id;
+        m_self_vote_detail.m_magnitude = detail.m_magnitude;
+        m_self_vote_detail.m_ismine = detail.m_ismine;
     }
 
     for (const auto& response_pair : detail.m_responses) {
@@ -1258,6 +1262,22 @@ void PollResult::TallyVote(VoteDetail detail)
         m_responses[response_offset].m_weight += response_weight;
         m_responses[response_offset].m_votes += 1.0 / detail.m_responses.size();
         m_total_weight += response_weight;
+
+        if (detail.m_ismine != ISMINE_NO) {
+            bool choice_found = false;
+
+            for (auto& choice : m_self_vote_detail.m_responses) {
+                if (choice.first == response_offset) {
+                    choice.second += response_weight;
+                    choice_found = true;
+                    break;
+                }
+            }
+
+            if (!choice_found) {
+                m_self_vote_detail.m_responses.push_back(std::make_pair(response_offset, response_weight));
+            }
+        }
     }
 
     m_votes.emplace_back(std::move(detail));

src/qt/forms/voting/pollcard.ui

@@ -201,14 +201,14 @@
         <item row="2" column="0">
          <widget class="QLabel" name="myLastVoteAnswerTextLabel">
           <property name="text">
-           <string>Your Last Vote:</string>
+           <string>Your Vote(s):</string>
           </property>
          </widget>
         </item>
         <item row="2" column="2">
          <widget class="QLabel" name="myVoteWeightTextLabel">
           <property name="text">
-           <string>Your Vote Weight:</string>
+           <string>Your Vote Weight(s):</string>
           </property>
          </widget>
         </item>

src/qt/voting/pollcard.cpp

@@ -39,6 +39,7 @@ PollCard::PollCard(const PollItem& poll_item, QWidget* parent)
         ui->myPercentAVWLabel->setText("N/A");
     } else {
         QString choices_str;
+        QString weights_str;
 
         int64_t my_total_weight = 0;
 
@@ -49,11 +50,17 @@ PollCard::PollCard(const PollItem& poll_item, QWidget* parent)
                 choices_str = QString(poll_item.m_choices[choice.first].m_label);
             }
 
+            if (!weights_str.isEmpty()) {
+                weights_str += ", " + QString::number(choice.second / COIN);
+            } else {
+                weights_str = QString::number(choice.second / COIN);
+            }
+
             my_total_weight += choice.second / COIN;
         }
 
         ui->myLastVoteAnswerLabel->setText(choices_str);
-        ui->myVoteWeightLabel->setText(QString::number(my_total_weight));
+        ui->myVoteWeightLabel->setText(weights_str);
         if (poll_item.m_active_weight) ui->myPercentAVWLabel->setText(QString::number((double) my_total_weight
                                                                                       / (double) poll_item.m_active_weight
                                                                                       * (double) 100.0, 'f', 4) + '\%');