Saving a Keyset w/o making changes (by using the "Save as New Custom Key Set"

button) caused IDLE to fail on restart (no new keyset was created in
config-keys.cfg).  Also true for Theme/highlights.  Python Bug 1064535.

M configDialog.py

Lib/idlelib/configDialog.py

@@ -1165,6 +1165,9 @@ class ConfigDialog(Toplevel):
                         cfgTypeHasChanges = True
             if cfgTypeHasChanges:
                 idleConf.userCfg[configType].Save()
+        for configType in ['keys', 'highlight']:
+            # save these even if unchanged!
+            idleConf.userCfg[configType].Save()
         self.ResetChangedItems() #clear the changed items dict
 
     def ActivateConfigChanges(self):