Send the moveTraces message after the figure's data has been updated.

This way, subclasses have access to the new figure state.

Author: jonmmease

Diff for: packages/python/plotly/plotly/basedatatypes.py

@@ -642,9 +642,6 @@ def data(self, new_data):
         # ### Check whether a move is needed ###
         if not all([i1 == i2 for i1, i2 in zip(new_inds, current_inds)]):
 
-            # #### Update widget, if any ####
-            self._send_moveTraces_msg(current_inds, new_inds)
-
             # #### Reorder trace elements ####
             # We do so in-place so we don't trigger traitlet property
             # serialization for the FigureWidget case
@@ -664,6 +661,9 @@ def data(self, new_data):
             for ni, trace_data in zip(new_inds, moving_traces_data):
                 self._data.insert(ni, trace_data)
 
+            # #### Update widget, if any ####
+            self._send_moveTraces_msg(current_inds, new_inds)
+
         # ### Update data defaults ###
         # There is to front-end syncronization to worry about so this
         # operations doesn't need to be in-place