Shift + scroll = horizontal scroll, Closes #5980

Only for TransferListWidget, PeerListWidget

src/gui/properties/peerlistwidget.cpp

@@ -35,6 +35,7 @@
 #include <QMenu>
 #include <QClipboard>
 #include <QMessageBox>
+#include <QWheelEvent>
 #ifdef QBT_USES_QT5
 #include <QTableView>
 #endif
@@ -455,3 +456,16 @@ void PeerListWidget::handleSortColumnChanged(int col)
     }
 }
 
+void PeerListWidget::wheelEvent(QWheelEvent *event)
+{
+    event->accept();
+
+    if(event->modifiers() & Qt::ShiftModifier) {
+        // Shift + scroll = horizontal scroll
+        QWheelEvent scrollHEvent(event->pos(), event->globalPos(), event->delta(), event->buttons(), event->modifiers(), Qt::Horizontal);
+        QTreeView::wheelEvent(&scrollHEvent);
+        return;
+    }
+
+    QTreeView::wheelEvent(event);  // event delegated to base class
+}

src/gui/properties/peerlistwidget.h

@@ -85,6 +85,8 @@ private slots:
     void handleResolved(const QString &ip, const QString &hostname);
 
 private:
+    void wheelEvent(QWheelEvent *event) override;
+
     QStandardItemModel *m_listModel;
     PeerListDelegate *m_listDelegate;
     PeerListSortModel *m_proxyModel;

src/gui/transferlistwidget.cpp

@@ -40,6 +40,7 @@
 #include <QRegExp>
 #include <QFileDialog>
 #include <QMessageBox>
+#include <QWheelEvent>
 #ifdef QBT_USES_QT5
 #include <QTableView>
 #endif
@@ -933,6 +934,20 @@ bool TransferListWidget::loadSettings()
     return ok;
 }
 
+void TransferListWidget::wheelEvent(QWheelEvent *event)
+{
+    event->accept();
+
+    if(event->modifiers() & Qt::ShiftModifier) {
+        // Shift + scroll = horizontal scroll
+        QWheelEvent scrollHEvent(event->pos(), event->globalPos(), event->delta(), event->buttons(), event->modifiers(), Qt::Horizontal);
+        QTreeView::wheelEvent(&scrollHEvent);
+        return;
+    }
+
+    QTreeView::wheelEvent(event);  // event delegated to base class
+}
+
 QStringList extractHashes(const QList<BitTorrent::TorrentHandle *> &torrents)
 {
     QStringList hashes;

src/gui/transferlistwidget.h

@@ -115,6 +115,8 @@ signals:
     void currentTorrentChanged(BitTorrent::TorrentHandle *const torrent);
 
 private:
+    void wheelEvent(QWheelEvent *event) override;
+
     TransferListDelegate *listDelegate;
     TorrentModel *listModel;
     TransferListSortModel *nameFilterModel;