Put temp files in .qBittorrent directory. Closes #4462.

src/base/net/downloadhandler.cpp

@@ -142,7 +142,7 @@ void DownloadHandler::init()
 
 bool DownloadHandler::saveToFile(const QByteArray &replyData, QString &filePath)
 {
-    QTemporaryFile *tmpfile = new QTemporaryFile;
+    QTemporaryFile *tmpfile = new QTemporaryFile(Utils::Fs::tempPath() + "XXXXXX");
     if (!tmpfile->open()) {
         delete tmpfile;
         return false;

src/base/utils/fs.cpp

@@ -491,3 +491,10 @@ QString Utils::Fs::cacheLocation()
         locationDir.mkpath(locationDir.absolutePath());
     return location;
 }
+
+QString Utils::Fs::tempPath()
+{
+    static const QString path = QDir::tempPath() + "/.qBittorrent/";
+    QDir().mkdir(path);
+    return path;
+}

src/base/utils/fs.h

@@ -67,6 +67,7 @@ namespace Utils
         /* End of Qt4 code */
 
         QString cacheLocation();
+        QString tempPath();
     }
 }