Simplify showing of main windows.

qutebrowser/app.py

@@ -114,10 +114,6 @@ class Application(QApplication):
         log.init.debug("Connecting signals...")
         self._connect_signals()
 
-        log.init.debug("Showing mainwindow...")
-        if not args.nowindow:
-            objreg.get('main-window', scope='window', window=0).show()
-
         log.init.debug("Applying python hacks...")
         self._python_hacks()
 
@@ -155,7 +151,7 @@ class Application(QApplication):
         download_manager = downloads.DownloadManager(self)
         objreg.register('download-manager', download_manager)
         log.init.debug("Initializing main window...")
-        mainwindow.create_window()
+        mainwindow.create_window(False if self._args.nowindow else True)
         log.init.debug("Initializing debug console...")
         debug_console = console.ConsoleWidget()
         objreg.register('debug-console', debug_console)

qutebrowser/browser/commands.py

@@ -108,7 +108,7 @@ class CommandDispatcher:
         elif window:
             # We have to import this here to avoid a circular import.
             from qutebrowser.widgets import mainwindow
-            win_id = mainwindow.create_window()
+            win_id = mainwindow.create_window(True)
             tabbed_browser = objreg.get('tabbed-browser', scope='window',
                                         window=win_id)
             tabbed_browser.tabopen(url)

qutebrowser/widgets/mainwindow.py

@@ -39,14 +39,19 @@ from qutebrowser.browser import hints
 win_id_gen = itertools.count(0)
 
 
-def create_window():
+def create_window(show):
     """Create a new main window.
 
+    Args:
+        show: Show the window after creating.
+
     Return:
         The new window id.
     """
     win_id = next(win_id_gen)
-    MainWindow(win_id)
+    win = MainWindow(win_id)
+    if show:
+        win.show()
     return win_id