minimal working version

src/backends/pyplot.jl

@@ -978,14 +978,21 @@ function _before_layout_calcs(plt::Plot{PyPlotBackend})
             cb."formatter".set_powerlimits((-Inf, Inf))
             cb."update_ticks"()
 
+            env = "\\mathregular"  # matches the outer fonts https://matplotlib.org/tutorials/text/mathtext.html
+            ticks = get_colorbar_ticks(sp)
+
             if sp[:colorbar] in (:top, :bottom)
                 axis = sp[:xaxis]  # colorbar inherits from x axis
                 cbar_axis = cb."ax"."xaxis"
+                ticks_letter=:x
             else
                 axis = sp[:yaxis]  # colorbar inherits from y axis
                 cbar_axis = cb."ax"."yaxis"
+                ticks_letter=:y
             end
 
+            sp[:colorbar_ticks] == :native ? nothing : py_set_ticks(cb.ax, ticks, ticks_letter, env)
+
             for lab in cbar_axis."get_ticklabels"()
                   lab."set_fontsize"(py_thickness_scale(plt, axis[:tickfontsize]))
                   lab."set_family"(axis[:tickfontfamily])

src/colorbars.jl

@@ -130,7 +130,7 @@ function optimal_colorbar_ticks_and_labels(sp::Subplot, ticks = nothing)
     unscaled_ticks = map(RecipesPipeline.inverse_scale_func(scale), scaled_ticks)
 
     labels = if any(isfinite, unscaled_ticks)
-        formatter = ap[:colorbar_formatter]
+        formatter = sp[:colorbar_formatter]
         if formatter in (:auto, :plain, :scientific, :engineering)
             map(labelfunc(scale, backend()), Showoff.showoff(scaled_ticks, formatter))
         elseif formatter == :latex
@@ -205,5 +205,5 @@ _transform_ticks(ticks::AbstractArray{T}) where T <: Dates.TimeType = Dates.valu
 _transform_ticks(ticks::NTuple{2, Any}) = (_transform_ticks(ticks[1]), ticks[2])
 
 function _update_subplot_colorbars(sp::Subplot)
-
+    # Dynamic callback from the pipeline if needed
 end