Fix possible crash with folder watching

src/bittorrent.cpp

@@ -281,12 +281,14 @@ void Bittorrent::configureSession() {
   startTorrentsInPause(Preferences::addTorrentsInPause());
   // * Scan dirs
   const QStringList &scan_dirs = Preferences::getScanDirs();
-  foreach (const QString &dir, scan_dirs) {
+  QVariantList downloadInDirList = Preferences::getDownloadInScanDirs();
-    m_scanFolders->addPath(dir);
+  while(scan_dirs.size() > downloadInDirList.size()) {
+    downloadInDirList << QVariant(false);
   }
-  const QVariantList &downloadInDirList = Preferences::getDownloadInScanDirs();
+  int i = 0;
-  for (int i = 0; i < downloadInDirList.count(); ++i) {
+  foreach (const QString &dir, scan_dirs) {
-    m_scanFolders->setDownloadAtPath(i, downloadInDirList.at(i).toBool());
+    m_scanFolders->addPath(dir, downloadInDirList.at(i).toBool());
+    ++i;
   }
   // * Export Dir
   const bool newTorrentExport = Preferences::isTorrentExportEnabled();

src/eventmanager.cpp

@@ -130,25 +130,29 @@ void EventManager::setGlobalPreferences(QVariantMap m) const {
     Preferences::setTempPathEnabled(m["temp_path_enabled"].toBool());
   if(m.contains("temp_path"))
     Preferences::setTempPath(m["temp_path"].toString());
-  if(m.contains("scan_dirs")) {
+  if(m.contains("scan_dirs") && m.contains("download_in_scan_dirs")) {
+    QVariantList download_at_path = m["download_in_scan_dirs"].toList();
     QStringList old_folders = Preferences::getScanDirs();
     QStringList new_folders = m["scan_dirs"].toStringList();
-    foreach(const QString &old_folder, old_folders) {
-      // Update deleted folders
-      if(!new_folders.contains(old_folder)) {
-        BTSession->getScanFoldersModel()->removePath(old_folder);
-      }
-    }
-    foreach(const QString &new_folder, new_folders) {
-      // Update new folders
-      if(!old_folders.contains(new_folder)) {
-        BTSession->getScanFoldersModel()->addPath(new_folder);
-      }
-    }
     Preferences::setScanDirs(new_folders);
+    Preferences::setDownloadInScanDirs(download_at_path);
+    if(download_at_path.size() == new_folders.size()) {
+      foreach(const QString &old_folder, old_folders) {
+        // Update deleted folders
+        if(!new_folders.contains(old_folder)) {
+          BTSession->getScanFoldersModel()->removePath(old_folder);
+        }
+      }
+      int i = 0;
+      foreach(const QString &new_folder, new_folders) {
+        // Update new folders
+        if(!old_folders.contains(new_folder)) {
+          BTSession->getScanFoldersModel()->addPath(new_folder, download_at_path.at(i).toBool());
+        }
+        ++i;
+      }
+    }
   }
-  if(m.contains("download_in_scan_dirs"))
-    Preferences::setDownloadInScanDirs(m["download_in_scan_dirs"].toList());
   if(m.contains("export_dir"))
     Preferences::setExportDir(m["export_dir"].toString());
   if(m.contains("preallocate_all"))

src/options_imp.cpp

@@ -1379,7 +1379,7 @@ int options_imp::getActionOnDblClOnTorrentFn() const {
 void options_imp::on_addScanFolderButton_clicked() {
   const QString dir = QFileDialog::getExistingDirectory(this, tr("Add directory to scan"));
   if (!dir.isEmpty()) {
-    const ScanFoldersModel::PathStatus status = ScanFoldersModel::instance()->addPath(dir);
+    const ScanFoldersModel::PathStatus status = ScanFoldersModel::instance()->addPath(dir, false);
     QString error;
     switch (status) {
     case ScanFoldersModel::AlreadyInList:

src/scannedfoldersmodel.cpp

@@ -110,7 +110,7 @@ bool ScanFoldersModel::setData(const QModelIndex &index, const QVariant &value,
   return true;
 }
 
-ScanFoldersModel::PathStatus ScanFoldersModel::addPath(const QString &path) {
+ScanFoldersModel::PathStatus ScanFoldersModel::addPath(const QString &path, bool download_at_path) {
   QDir dir(path);
   if (!dir.exists())
     return DoesNotExist;
@@ -126,6 +126,9 @@ ScanFoldersModel::PathStatus ScanFoldersModel::addPath(const QString &path) {
   beginInsertRows(QModelIndex(), rowCount(), rowCount());
   m_pathList << new PathData(canonicalPath);
   endInsertRows();
+  // Set download at path
+  setDownloadAtPath(m_pathList.size()-1, download_at_path);
+  // Start scanning
   m_fsWatcher->addPath(canonicalPath);
   return Ok;
 }

src/scannedfoldersmodel.h

@@ -55,7 +55,7 @@ public:
 
   // TODO: removePaths(); singular version becomes private helper functions;
   // also: remove functions should take modelindexes
-  PathStatus addPath(const QString &path);
+  PathStatus addPath(const QString &path, bool download_at_path);
   void removePath(int row);
   bool removePath(const QString &path);
   PathStatus setDownloadAtPath(int row, bool downloadAtPath);