Ensure all clone methods correctly retain id (#2013)

holoviews/core/ndmapping.py

@@ -763,7 +763,7 @@ def clone(self, data=None, shared_data=True, new_type=None, *args, **overrides):
             settings = {k: v for k, v in settings.items()
                       if k in new_params}
         settings = dict(settings, **overrides)
-        if 'id' not in settings:
+        if 'id' not in settings and new_type in [type(self), None]:
             settings['id'] = self.id
 
         if data is None and shared_data:

holoviews/element/annotation.py

@@ -66,6 +66,8 @@ def clone(self, *args, **overrides):
         pos_args = getattr(self, '_' + type(self).__name__ + '__pos_params', [])
         settings = {k: v for k, v in dict(self.get_param_values(), **overrides).items()
                     if k not in pos_args[:len(args)]}
+        if 'id' not in settings:
+            settings['id'] = self.id
         return self.__class__(*args, **settings)
 
 

holoviews/element/path.py

@@ -200,6 +200,8 @@ def clone(self, *args, **overrides):
         containing the specified args and kwargs.
         """
         settings = dict(self.get_param_values(), **overrides)
+        if 'id' not in settings:
+            settings['id'] = self.id
         if not args:
             settings['plot_id'] = self._plot_id