Replace a series of `if()` by `switch()`

src/gui/transferlistfilterswidget.cpp

@@ -583,16 +583,18 @@ QString TrackerFiltersList::getHost(const QString &tracker) const
     return longHost.mid(index + 1);
 }
 
-QStringList TrackerFiltersList::getHashes(int row)
+QStringList TrackerFiltersList::getHashes(const int row) const
 {
-    if (row == 1)
+    switch (row) {
+    case 1:
         return m_trackers.value("");
-    if (row == 2)
+    case 2:
         return m_errors.keys();
-    if (row == 3)
+    case 3:
         return m_warnings.keys();
-
+    default:
         return m_trackers.value(trackerFromRow(row));
+    }
 }
 
 TransferListFiltersWidget::TransferListFiltersWidget(QWidget *parent, TransferListWidget *transferList, const bool downloadFavicon)

src/gui/transferlistfilterswidget.h

@@ -126,7 +126,7 @@ private:
     QString trackerFromRow(int row) const;
     int rowFromTracker(const QString &tracker) const;
     QString getHost(const QString &tracker) const;
-    QStringList getHashes(int row);
+    QStringList getHashes(int row) const;
     void downloadFavicon(const QString &url);
 
     QHash<QString, QStringList> m_trackers;