Fix issues with selections on Masternode tab (#2170)

Preserve selection on "My Masternodes" sub-tab, disable selections on "All Masternodes" sub-tab.

Author: UdjinM6

src/qt/forms/masternodelist.ui

@@ -228,6 +228,9 @@
            <property name="selectionBehavior">
             <enum>QAbstractItemView::SelectRows</enum>
            </property>
+           <property name="selectionMode">
+            <enum>QAbstractItemView::NoSelection</enum>
+           </property>
            <property name="sortingEnabled">
             <bool>true</bool>
            </property>

src/qt/masternodelist.cpp

@@ -242,6 +242,11 @@ void MasternodeList::updateMyNodeList(bool fForce)
     if(nSecondsTillUpdate > 0 && !fForce) return;
     nTimeMyListUpdated = GetTime();
 
+    // Find selected row
+    QItemSelectionModel* selectionModel = ui->tableWidgetMyMasternodes->selectionModel();
+    QModelIndexList selected = selectionModel->selectedRows();
+    int nSelectedRow = selected.count() ? selected.at(0).row() : 0;
+
     ui->tableWidgetMyMasternodes->setSortingEnabled(false);
     for (const auto& mne : masternodeConfig.getEntries()) {
         int32_t nOutputIndex = 0;
@@ -251,7 +256,7 @@ void MasternodeList::updateMyNodeList(bool fForce)
 
         updateMyMasternodeInfo(QString::fromStdString(mne.getAlias()), QString::fromStdString(mne.getIp()), COutPoint(uint256S(mne.getTxHash()), nOutputIndex));
     }
-    ui->tableWidgetMyMasternodes->selectRow(0);
+    ui->tableWidgetMyMasternodes->selectRow(nSelectedRow);
     ui->tableWidgetMyMasternodes->setSortingEnabled(true);
 
     // reset "timer"