Make torrent sorting case insensitive (Closes #857154)

src/torrentfilesmodel.h

@@ -620,6 +620,7 @@ public:
     setFilterKeyColumn(TorrentFileItem::COL_NAME);
     setFilterRole(Qt::DisplayRole);
     setDynamicSortFilter(true);
+    setSortCaseSensitivity(Qt::CaseInsensitive);
   }
 
   ~TorrentFilesFilterModel() {

src/transferlistwidget.cpp

@@ -94,6 +94,7 @@ TransferListWidget::TransferListWidget(QWidget *parent, MainWindow *main_window,
   nameFilterModel->setSourceModel(statusFilterModel);
   nameFilterModel->setFilterKeyColumn(TorrentModelItem::TR_NAME);
   nameFilterModel->setFilterRole(Qt::DisplayRole);
+  nameFilterModel->setSortCaseSensitivity(Qt::CaseInsensitive);
 
   setModel(nameFilterModel);