Fix segfault on Linux due to early initialization of global var.

Utils::Misc::pythonVersion() gets called before the Logger is initialized.

src/searchengine/engineselectdlg.cpp

@@ -48,9 +48,12 @@
 #include <QMimeData>
 
 enum EngineColumns {ENGINE_NAME, ENGINE_VERSION, ENGINE_URL, ENGINE_STATE, ENGINE_ID};
-const QString UPDATE_URL = QString("https://raw.github.com/qbittorrent/qBittorrent/master/src/searchengine/") + (Utils::Misc::pythonVersion() >= 3 ? "nova3" : "nova") + "/engines/";
 
-engineSelectDlg::engineSelectDlg(QWidget *parent, SupportedEngines *supported_engines) : QDialog(parent), supported_engines(supported_engines) {
+engineSelectDlg::engineSelectDlg(QWidget *parent, SupportedEngines *supported_engines)
+    : QDialog(parent)
+    , supported_engines(supported_engines)
+    , m_updateUrl(QString("https://raw.github.com/qbittorrent/qBittorrent/master/src/searchengine/") + (Utils::Misc::pythonVersion() >= 3 ? "nova3" : "nova") + "/engines/")
+{
   setupUi(this);
   setAttribute(Qt::WA_DeleteOnClose);
   pluginsTree->setRootIsDecorated(false);
@@ -107,7 +110,7 @@ void engineSelectDlg::dragEnterEvent(QDragEnterEvent *event) {
 void engineSelectDlg::on_updateButton_clicked() {
   // Download version file from update server on sourceforge
   setCursor(QCursor(Qt::WaitCursor));
-  downloadFromUrl(QString(UPDATE_URL) + "versions.txt");
+  downloadFromUrl(m_updateUrl + "versions.txt");
 }
 
 void engineSelectDlg::toggleEngineState(QTreeWidgetItem *item, int) {
@@ -394,8 +397,8 @@ bool engineSelectDlg::parseVersionsFile(QString versions_file) {
       qDebug("Plugin: %s is outdated", qPrintable(plugin_name));
       // Downloading update
       setCursor(QCursor(Qt::WaitCursor));
-      downloadFromUrl(UPDATE_URL + plugin_name + ".py");
-      //downloadFromUrl(UPDATE_URL + plugin_name + ".png");
+      downloadFromUrl(m_updateUrl + plugin_name + ".py");
+      //downloadFromUrl(m_updateUrl + plugin_name + ".png");
       updated = true;
     }else {
       qDebug("Plugin: %s is up to date", qPrintable(plugin_name));

src/searchengine/engineselectdlg.h

@@ -45,6 +45,7 @@ class engineSelectDlg : public QDialog, public Ui::engineSelect{
     void downloadFromUrl(const QString &url);
 
     SupportedEngines *supported_engines;
+    const QString m_updateUrl;
 
   public:
     engineSelectDlg(QWidget *parent, SupportedEngines *supported_engines);