[pygobject/wip/mschraal/gtk4-menu-deprecation] gtk overrides: Drop Menu, MenuItem for Gtk 4

[Marinus Schraal <mschraal src gnome org>]

commit e8812025b31ac9f3148e87339b6012359f135ac2
Author: Marinus Schraal <mschraal gnome org>
Date:   Sun Jan 19 14:17:15 2020 +0100

    gtk overrides: Drop Menu, MenuItem for Gtk 4
    
    These API's have been removed (gtk#7ee5779efcf5).

 gi/overrides/Gtk.py | 15 ++++++++-------
 1 file changed, 8 insertions(+), 7 deletions(-)
---
diff --git a/gi/overrides/Gtk.py b/gi/overrides/Gtk.py
index 3ea02ae1..e04e472f 100644
--- a/gi/overrides/Gtk.py
+++ b/gi/overrides/Gtk.py
@@ -452,14 +452,15 @@ SizeGroup = override(SizeGroup)
 __all__.append('SizeGroup')
 
 
-class MenuItem(Gtk.MenuItem):
-    __init__ = deprecated_init(Gtk.MenuItem.__init__,
-                               arg_names=('label',),
-                               category=PyGTKDeprecationWarning)
+if Gtk._version in ("2.0", "3.0"):
+    class MenuItem(Gtk.MenuItem):
+        __init__ = deprecated_init(Gtk.MenuItem.__init__,
+                                   arg_names=('label',),
+                                   category=PyGTKDeprecationWarning)
 
 
-MenuItem = override(MenuItem)
-__all__.append('MenuItem')
+    MenuItem = override(MenuItem)
+    __all__.append('MenuItem')
 
 
 def _get_utf8_length(string):
@@ -1607,7 +1608,7 @@ class TreeModelFilter(Gtk.TreeModelFilter):
 TreeModelFilter = override(TreeModelFilter)
 __all__.append('TreeModelFilter')
 
-if Gtk._version != '2.0':
+if Gtk._version == '3.0':
     class Menu(Gtk.Menu):
         def popup(self, parent_menu_shell, parent_menu_item, func, data, button, activate_time):
             self.popup_for_device(None, parent_menu_shell, parent_menu_item, func, data, button, 
activate_time)