Use FileDialog for all file/path pickers

bottles/frontend/windows/launchoptions.py

@@ -312,25 +312,33 @@ def __reset_post_script(self, *_args):
         self.btn_post_script_reset.set_visible(False)
 
     def __choose_cwd(self, *_args):
-        def set_path(dialog, response):
-            if response != Gtk.ResponseType.ACCEPT:
-                self.action_cwd.set_subtitle(self.__default_cwd_msg)
-                return
-
-            directory_path = dialog.get_file().get_path()
-            self.program["folder"] = directory_path
-            self.action_cwd.set_subtitle(directory_path)
-            self.btn_cwd_reset.set_visible(True)
+        def set_path(dialog, result):
+            try:
+                directory = dialog.select_folder_finish(result)
 
-        dialog = Gtk.FileChooserNative.new(
-            title=_("Select Working Directory"),
-            parent=self.window,
-            action=Gtk.FileChooserAction.SELECT_FOLDER,
-        )
+                if directory is None:
+                    self.action_cwd.set_subtitle(self.__default_cwd_msg)
+                    return
 
+                directory_path = directory.get_path()
+                self.program["folder"] = directory_path
+                self.action_cwd.set_subtitle(directory_path)
+                self.btn_cwd_reset.set_visible(True)
+            except GLib.Error as error:
+                # also thrown when dialog has been cancelled
+                if error.code == 2:
+                    # error 2 seems to be 'dismiss' or 'cancel'
+                    if self.program["folder"] is None or self.program["folder"] == "":
+                        self.action_cwd.set_subtitle(self.__default_cwd_msg)
+                else:
+                    # something else happened...
+                    logging.warning("Error selecting folder: %s" % error)
+                    raise
+
+        dialog = Gtk.FileDialog.new()
+        dialog.set_title(_("Select Working Directory"))
         dialog.set_modal(True)
-        dialog.connect("response", set_path)
-        dialog.show()
+        dialog.select_folder(parent=self.window, callback=set_path)
 
     def __reset_cwd(self, *_args):
         """