Fix Preview for .!qB extended files

src/fs_utils.cpp

@@ -81,8 +81,18 @@ QString fsutils::toDisplayPath(const QString& path)
  */
 QString fsutils::fileExtension(const QString &filename)
 {
-  const int point_index = filename.lastIndexOf(".");
-  return (point_index >= 0) ? filename.mid(point_index + 1) : QString();
+  QString holder;
+  int point_index = filename.lastIndexOf(".");
+  if (point_index >= 0) {
+    QString holder = filename.mid(point_index + 1);
+    if (holder == "!qB") {
+      holder = filename.mid(0, point_index);
+      point_index = holder.lastIndexOf(".");
+      holder = (point_index >= 0) ? holder.mid(point_index + 1) : QString();
+    }
+    return holder;
+  }
+  return QString();
 }
 
 QString fsutils::fileName(const QString& file_path)

src/previewselect.cpp

@@ -39,6 +39,7 @@
 #include "misc.h"
 #include "previewlistdelegate.h"
 #include "previewselect.h"
+#include "fs_utils.h"
 
 PreviewSelect::PreviewSelect(QWidget* parent, QTorrentHandle h): QDialog(parent), h(h) {
   setupUi(this);
@@ -58,7 +59,7 @@ PreviewSelect::PreviewSelect(QWidget* parent, QTorrentHandle h): QDialog(parent)
   unsigned int nbFiles = h.num_files();
   for (unsigned int i=0; i<nbFiles; ++i) {
     QString fileName = h.filename_at(i);
-    QString extension = fileName.split(QString::fromUtf8(".")).last().toUpper();
+    QString extension = fsutils::fileExtension(fileName).toUpper();
     if (misc::isPreviewable(extension)) {
       int row = previewListModel->rowCount();
       previewListModel->insertRow(row);