...

src/calibre/gui2/main.py

@@ -121,7 +121,8 @@ class GuiRunner(QObject):
 
     def start_gui(self):
         from calibre.gui2.ui import Main
-        main = Main(self.library_path, self.db, self.listener, self.opts, self.actions)
+        main = Main(self.opts)
+        main.initialize(self.library_path, self.db, self.listener, self.actions)
         add_filesystem_book = partial(main.add_filesystem_book, allow_device=False)
         sys.excepthook = main.unhandled_exception
         if len(self.args) > 1:

src/calibre/gui2/ui.py

@@ -127,13 +127,18 @@ class Main(MainWindow, Ui_MainWindow, DeviceGUI):
                 pixmap_to_data(pixmap))
 
         self.last_time = datetime.datetime.now()
-    def __init__(self, library_path, db, listener, opts, actions, parent=None):
+
+    def __init__(self, opts, parent=None):
+        MainWindow.__init__(self, opts, parent)
+        self.opts = opts
+
+    def initialize(self, library_path, db, listener, actions):
+        opts = self.opts
         self.last_time = datetime.datetime.now()
         self.preferences_action, self.quit_action = actions
         self.library_path = library_path
         self.spare_servers = []
         self.must_restart_before_config = False
-        MainWindow.__init__(self, opts, parent)
         # Initialize fontconfig in a separate thread as this can be a lengthy
         # process if run for the first time on this machine
         from calibre.utils.fonts import fontconfig