Porting QT memory fixes

src/qt/overviewpage.cpp

@@ -25,9 +25,9 @@ class TxViewDelegate : public QAbstractItemDelegate
 {
     Q_OBJECT
 public:
-    TxViewDelegate(const PlatformStyle *platformStyle):
-        QAbstractItemDelegate(), unit(BitcoinUnits::BTC),
-        platformStyle(platformStyle)
+    TxViewDelegate(const PlatformStyle *_platformStyle, QObject *parent=nullptr):
+        QAbstractItemDelegate(parent), unit(BitcoinUnits::BTC),
+        platformStyle(_platformStyle)
     {
 
     }
@@ -119,8 +119,7 @@ OverviewPage::OverviewPage(const PlatformStyle *platformStyle, QWidget *parent)
     currentWatchOnlyBalance(-1),
     currentWatchUnconfBalance(-1),
     currentWatchImmatureBalance(-1),
-    txdelegate(new TxViewDelegate(platformStyle)),
-    filter(0)
+    txdelegate(new TxViewDelegate(platformStyle, this))
 {
     ui->setupUi(this);
 
@@ -213,7 +212,7 @@ void OverviewPage::setWalletModel(WalletModel *model)
     if(model && model->getOptionsModel())
     {
         // Set up transaction list
-        filter = new TransactionFilterProxy();
+        filter.reset(new TransactionFilterProxy());
         filter->setSourceModel(model->getTransactionTableModel());
         filter->setLimit(NUM_ITEMS);
         filter->setDynamicSortFilter(true);
@@ -221,7 +220,7 @@ void OverviewPage::setWalletModel(WalletModel *model)
         filter->setShowInactive(false);
         filter->sort(TransactionTableModel::Status, Qt::DescendingOrder);
 
-        ui->listTransactions->setModel(filter);
+        ui->listTransactions->setModel(filter.get());
         ui->listTransactions->setModelColumn(TransactionTableModel::ToAddress);
 
         // Keep up to date with wallet