Main: Use popover menu

gajim/data/gui/main.ui

@@ -180,7 +180,6 @@
                             <property name="can-focus">True</property>
                             <property name="focus-on-click">False</property>
                             <property name="receives-default">True</property>
-                            <property name="use-popover">False</property>
                             <child>
                               <object class="GtkImage">
                                 <property name="visible">True</property>

gajim/gtk/main.py

@@ -8,7 +8,6 @@
 from gajim.common import app
 from gajim.common import ged
 from gajim.common.helpers import ask_for_status_message
-from gajim.common.helpers import jid_is_blocked
 from gajim.common.i18n import _
 from gajim.common.nec import EventHelper
 
@@ -555,7 +554,8 @@ def _load_chats(self):
 
         self._startup_finished = True
 
-    def _on_start_chat_clicked(self, _button):
+    @staticmethod
+    def _on_start_chat_clicked(_button):
         app.app.activate_action('start-chat', GLib.Variant('s', ''))
 
     def _on_event(self, event):