force the template via override

Author: nicolaskruchten

Diff for: packages/python/plotly/plotly/express/_core.py

@@ -1258,7 +1258,7 @@ def make_figure(args, constructor, trace_patch={}, layout_patch={}):
             cmax=range_color[1],
             colorbar=dict(title=get_decorated_label(args, args[colorvar], colorvar)),
         )
-    for v in ["title", "height", "width", "template"]:
+    for v in ["title", "height", "width"]:
         if args[v]:
             layout_patch[v] = args[v]
     layout_patch["legend"] = {"tracegroupgap": 0}
@@ -1293,6 +1293,8 @@ def make_figure(args, constructor, trace_patch={}, layout_patch={}):
     # Add traces, layout and frames to figure
     fig.add_traces(frame_list[0]["data"] if len(frame_list) > 0 else [])
     fig.layout.update(layout_patch)
+    if "template" in args and args["template"] is not None:
+        fig.update_layout(template=args["template"], overwrite=True)
     fig.frames = frame_list if len(frames) > 1 else []
 
     fig._px_trendlines = pd.DataFrame(trendline_rows)