[macOS] Fix GTK windowing issues

On macOS the Quartz windowing is used instead of X11 so make ensure
that the X11 window calls are optional.

Also if gtkosx_application is not available then don't create osxapp.

It would be useful to find out how to pass window timestamps on Quartz.

deluge/ui/gtk3/addtorrentdialog.py

@@ -174,7 +174,11 @@ class AddTorrentDialog(component.Component):
         self.dialog.present()
         if focus:
             timestamp = main_window.get_timestamp()
-            self.dialog.get_window().set_user_time(timestamp)
+            try:
+                self.dialog.get_window().set_user_time(timestamp)
+            except AttributeError:
+                # Not an X11 windowing system
+                pass
 
     def hide(self):
         self.dialog.hide()

deluge/ui/gtk3/gtkui.py

@@ -154,17 +154,21 @@ class GtkUI(object):
             log.debug('OS signal "die" caught with args: %s', args)
             reactor.stop()
 
+        self.osxapp = None
         if windows_check():
             from win32api import SetConsoleCtrlHandler
 
             SetConsoleCtrlHandler(on_die, True)
             log.debug('Win32 "die" handler registered')
         elif osx_check() and windowing('quartz'):
-            import gtkosx_application
-
-            self.osxapp = gtkosx_application.gtkosx_application_get()
-            self.osxapp.connect('NSApplicationWillTerminate', on_die)
-            log.debug('OSX quartz "die" handler registered')
+            try:
+                import gtkosx_application
+            except ImportError:
+                pass
+            else:
+                self.osxapp = gtkosx_application.gtkosx_application_get()
+                self.osxapp.connect('NSApplicationWillTerminate', on_die)
+                log.debug('OSX quartz "die" handler registered')
 
         # Set process name again to fix gtk issue
         setproctitle(getproctitle())
@@ -207,7 +211,7 @@ class GtkUI(object):
         self.statusbar = StatusBar()
         self.addtorrentdialog = AddTorrentDialog()
 
-        if osx_check() and windowing('quartz'):
+        if self.osxapp:
 
             def nsapp_open_file(osxapp, filename):
                 # Ignore command name which is raised at app launch (python opening main script).

deluge/ui/gtk3/mainwindow.py

@@ -13,7 +13,7 @@ import logging
 import os.path
 from hashlib import sha1 as sha
 
-from gi.repository import GdkX11, Gtk
+from gi.repository import Gtk
 from gi.repository.Gdk import DragAction, WindowState
 from twisted.internet import reactor
 from twisted.internet.error import ReactorNotRunning
@@ -35,6 +35,10 @@ try:
 except ValueError:
     Wnck = None
 
+try:
+    from gi.repository import GdkX11
+except ImportError:
+    GdkX11 = None
 
 log = logging.getLogger(__name__)
 
@@ -173,7 +177,8 @@ class MainWindow(component.Component):
             # Restore the proper x,y coords for the window prior to showing it
             component.resume(self.child_components)
             self.window.present()
-            self.window.get_window().set_user_time(self.get_timestamp())
+            if GdkX11:
+                self.window.get_window().set_user_time(self.get_timestamp())
             self.load_window_state()
 
         if self.config['lock_tray'] and not self.visible():
@@ -195,7 +200,7 @@ class MainWindow(component.Component):
         """Returns the timestamp for the windowing server."""
         timestamp = 0
         gdk_window = self.window.get_window()
-        if isinstance(gdk_window, GdkX11.X11Window):
+        if GdkX11 and isinstance(gdk_window, GdkX11.X11Window):
             timestamp = GdkX11.x11_get_server_time(gdk_window)
         return timestamp