Merge #16706: qt: Replace deprecated QSignalMapper by lambda expressions

0912134 qt: Remove QSignalMapper from TransactionView (Hennadii Stepanov)
9e0c1d6 qt: Remove QSignalMapper from RPCConsole (Hennadii Stepanov)

Pull request description:

  The [`QSignalMapper`](https://doc.qt.io/qt-5/qsignalmapper.html) class has been [deprecated](https://doc-snapshots.qt.io/qt5-5.10/obsoleteclasses.html) since Qt 5.10.

  This PR replaces it by lambdas and does not change behavior.

ACKs for top commit:
  jonasschnelli:
    utACK 0912134

Tree-SHA512: 0c102d5cab4adc8b6252f72e07123ac87c65434c88cada3e72816ecea8fc4803f15b9c050fb5e1c7e8a96f709265521fd6813ab1890dbf5634032f7ee0d50675

src/qt/rpcconsole.cpp

@@ -34,7 +34,6 @@
 #include <QScrollBar>
 #include <QScreen>
 #include <QSettings>
-#include <QSignalMapper>
 #include <QTime>
 #include <QTimer>
 #include <QStringList>
@@ -614,19 +613,10 @@ void RPCConsole::setClientModel(ClientModel *model)
         peersTableContextMenu->addAction(banAction7d);
         peersTableContextMenu->addAction(banAction365d);
 
-        // Add a signal mapping to allow dynamic context menu arguments.
-        // We need to use int (instead of int64_t), because signal mapper only supports
-        // int or objects, which is okay because max bantime (1 year) is < int_max.
-        QSignalMapper* signalMapper = new QSignalMapper(this);
-        signalMapper->setMapping(banAction1h, 60*60);
-        signalMapper->setMapping(banAction24h, 60*60*24);
-        signalMapper->setMapping(banAction7d, 60*60*24*7);
-        signalMapper->setMapping(banAction365d, 60*60*24*365);
-        connect(banAction1h, &QAction::triggered, signalMapper, static_cast<void (QSignalMapper::*)()>(&QSignalMapper::map));
-        connect(banAction24h, &QAction::triggered, signalMapper, static_cast<void (QSignalMapper::*)()>(&QSignalMapper::map));
-        connect(banAction7d, &QAction::triggered, signalMapper, static_cast<void (QSignalMapper::*)()>(&QSignalMapper::map));
-        connect(banAction365d, &QAction::triggered, signalMapper, static_cast<void (QSignalMapper::*)()>(&QSignalMapper::map));
-        connect(signalMapper, static_cast<void (QSignalMapper::*)(int)>(&QSignalMapper::mapped), this, &RPCConsole::banSelectedNode);
+        connect(banAction1h, &QAction::triggered, [this] { banSelectedNode(60 * 60); });
+        connect(banAction24h, &QAction::triggered, [this] { banSelectedNode(60 * 60 * 24); });
+        connect(banAction7d, &QAction::triggered, [this] { banSelectedNode(60 * 60 * 24 * 7); });
+        connect(banAction365d, &QAction::triggered, [this] { banSelectedNode(60 * 60 * 24 * 365); });
 
         // peer table context menu signals
         connect(ui->peerWidget, &QTableView::customContextMenuRequested, this, &RPCConsole::showPeersTableContextMenu);

src/qt/transactionview.cpp

@@ -30,7 +30,6 @@
 #include <QMenu>
 #include <QPoint>
 #include <QScrollBar>
-#include <QSignalMapper>
 #include <QTableView>
 #include <QTimer>
 #include <QUrl>
@@ -176,11 +175,6 @@ TransactionView::TransactionView(const PlatformStyle *platformStyle, QWidget *pa
     contextMenu->addAction(abandonAction);
     contextMenu->addAction(editLabelAction);
 
-    mapperThirdPartyTxUrls = new QSignalMapper(this);
-
-    // Connect actions
-    connect(mapperThirdPartyTxUrls, static_cast<void (QSignalMapper::*)(const QString&)>(&QSignalMapper::mapped), this, &TransactionView::openThirdPartyTxUrl);
-
     connect(dateWidget, static_cast<void (QComboBox::*)(int)>(&QComboBox::activated), this, &TransactionView::chooseDate);
     connect(typeWidget, static_cast<void (QComboBox::*)(int)>(&QComboBox::activated), this, &TransactionView::chooseType);
     connect(watchOnlyWidget, static_cast<void (QComboBox::*)(int)>(&QComboBox::activated), this, &TransactionView::chooseWatchonly);
@@ -246,15 +240,15 @@ void TransactionView::setModel(WalletModel *_model)
             QStringList listUrls = _model->getOptionsModel()->getThirdPartyTxUrls().split("|", QString::SkipEmptyParts);
             for (int i = 0; i < listUrls.size(); ++i)
             {
-                QString host = QUrl(listUrls[i].trimmed(), QUrl::StrictMode).host();
+                QString url = listUrls[i].trimmed();
+                QString host = QUrl(url, QUrl::StrictMode).host();
                 if (!host.isEmpty())
                 {
                     QAction *thirdPartyTxUrlAction = new QAction(host, this); // use host as menu item label
                     if (i == 0)
                         contextMenu->addSeparator();
                     contextMenu->addAction(thirdPartyTxUrlAction);
-                    connect(thirdPartyTxUrlAction, &QAction::triggered, mapperThirdPartyTxUrls, static_cast<void (QSignalMapper::*)()>(&QSignalMapper::map));
-                    mapperThirdPartyTxUrls->setMapping(thirdPartyTxUrlAction, listUrls[i].trimmed());
+                    connect(thirdPartyTxUrlAction, &QAction::triggered, [this, url] { openThirdPartyTxUrl(url); });
                 }
             }
         }

src/qt/transactionview.h

@@ -23,7 +23,6 @@ class QFrame;
 class QLineEdit;
 class QMenu;
 class QModelIndex;
-class QSignalMapper;
 class QTableView;
 QT_END_NAMESPACE
 
@@ -72,7 +71,6 @@ class TransactionView : public QWidget
     QLineEdit *amountWidget;
 
     QMenu *contextMenu;
-    QSignalMapper *mapperThirdPartyTxUrls;
 
     QFrame *dateRangeWidget;
     QDateTimeEdit *dateFrom;