GeoMakie ext: no shading by default

GeoMakie extension `heatmap2D_on_globe!()`
did not specify the default shading, therefore it had shading (Makie
default), which made plots where obscured in some regions, making it
difficult to clearly visualize colors. This commit fixes this issue by changing the default
shading to noshading.

NEWS.md

@@ -52,6 +52,7 @@ pfull_var = ClimaAnalysis.get(simdir, short_name = "pfull", reduction = "2.0d",
 - `Var.shift_to_start_of_previous_month` now checks for duplicate dates and throws an error
 if duplicate dates are detected.
 - Fix issue with plotting multiple figures at the same time.
+- Improve shading for `Visualize.heatmap2D_on_globe!`.
 
 v0.5.10
 -------

ext/ClimaAnalysisGeoMakieExt.jl

@@ -163,14 +163,17 @@ function Visualize.heatmap2D_on_globe!(
         :mask => Dict(),
     ),
 )
+    default_kwargs = Dict(:plot => Dict(:shading => Makie.NoShading))
+    default_and_more_kwargs =
+        ClimaAnalysis.Utils._recursive_merge(default_kwargs, more_kwargs)
     return _geomakie_plot_on_globe!(
         place,
         var;
         p_loc,
         plot_coastline,
         plot_colorbar,
         mask,
-        more_kwargs,
+        more_kwargs = default_and_more_kwargs,
         plot_fn = Makie.surface!,
     )
 end