Patch 1693258: Fix for duplicate "preferences" menu-OS X

Backport of 56204.

Lib/idlelib/macosxSupport.py

@@ -80,15 +80,27 @@ def overrideRootMenu(root, flist):
         import configDialog
         configDialog.ConfigDialog(root, 'Settings')
 
+
     root.bind('<<about-idle>>', about_dialog)
     root.bind('<<open-config-dialog>>', config_dialog)
     if flist:
         root.bind('<<close-all-windows>>', flist.close_all_callback)
 
+
+    ###check if Tk version >= 8.4.14; if so, use hard-coded showprefs binding
+    tkversion = root.tk.eval('info patchlevel')
+    if tkversion >= '8.4.14':
+        Bindings.menudefs[0] =  ('application', [
+                ('About IDLE', '<<about-idle>>'),
+                None,
+            ])
+        root.createcommand('::tk::mac::ShowPreferences', config_dialog)
+    else:
         for mname, entrylist in Bindings.menudefs:
             menu = menudict.get(mname)
             if not menu:
                 continue
+            else:
                 for entry in entrylist:
                     if not entry:
                         menu.add_separator()
@@ -102,10 +114,6 @@ def overrideRootMenu(root, flist):
                         menu.add_command(label=label, underline=underline,
                         command=command, accelerator=accelerator)
 
-
-
-
-
 def setupApp(root, flist):
     """
     Perform setup for the OSX application bundle.