turn extra_kwargs into Dict of Dicts

src/args.jl

@@ -281,7 +281,6 @@ const _series_defaults = KW(
                                      #     one logical series to be broken up (path and markers, for example)
     :hover              => nothing,  # text to display when hovering over the data points
     :stride             => (1,1),    # array stride for wireframe/surface, the first element is the row stride and the second is the column stride.
-    :extra_kwargs       => KW(),
 )
 
 

src/backends/pgfplots.jl

@@ -158,10 +158,9 @@ end
 
 # --------------------------------------------------------------------------------------
 
-function pgf_series(sp::Subplot, series::Series)
+function pgf_series(sp::Subplot, series::Series, extra_series_kwargs)
     plotattributes = series.plotattributes
     st = plotattributes[:seriestype]
-    extra_kwargs = plotattributes[:extra_kwargs]
     series_collection = PGFPlots.Plot[]
 
     # function args
@@ -540,7 +539,7 @@ function _update_plot_object(plt::Plot{PGFPlotsBackend})
 
         # add the series object to the PGFPlots.Axis
         for series in series_list(sp)
-            push!.(Ref(o), pgf_series(sp, series))
+            push!.(Ref(o), pgf_series(sp, series, plt[:extra_kwargs][:series]))
 
             # add series annotations
             anns = series[:series_annotations]

src/pipeline.jl

@@ -341,7 +341,7 @@ function _expand_subplot_extrema(sp::Subplot, plotattributes::AKW, st::Symbol)
 end
 
 function _add_the_series(plt, sp, plotattributes)
-    plotattributes[:extra_kwargs] = warnOnUnsupported_args(plt.backend, plotattributes)
+    plt[:extra_kwargs][:series] = warnOnUnsupported_args(plt.backend, plotattributes)
     warnOnUnsupported(plt.backend, plotattributes)
     series = Series(plotattributes)
     push!(plt.series_list, series)