Move fillrange and ribbon logic from RecipesPipeline and add tests for default function (#4030)

* add tests for default function

* remove fillrange and ribbon handling from RecipesPipeline

* adjust compat

test/test_defaults.jl

@@ -12,6 +12,14 @@ end
 empty!(PLOTS_DEFAULTS)
 Plots.__init__()
 
+@testset "default" begin
+    default(fillrange=0)
+    @test Plots._series_defaults[:fillrange] == 0
+    pl = plot(1:5)
+    @test pl[1][1][:fillrange] == 0
+    default()
+end
+
 @testset "Legend defaults" begin
     p = plot()
     @test p[1][:legend_font_family] == "sans-serif"

test/test_pipeline.jl

@@ -17,3 +17,14 @@ end
     @test all(RecipesPipeline.get_axis_limits(p1, :x) .== x)
     @test all(RecipesPipeline.get_axis_limits(p2, :x) .== x)
 end
+
+@testset "Slicing" begin
+
+    @test plot(1:5, fillrange = 0)[1][1][:fillrange] == 0
+    data4 = rand(4,4)
+    for i in axes(data4, 1)
+        @test plot(data4, fillrange = 0)[1][i][:fillrange] == 0
+        @test plot(data4, fillrange = [1, 2])[1][i][:fillrange] == [1.0, 2.0]
+        @test plot(data4, fillrange = [1 2])[1][i][:fillrange] == (iseven(i) ? 2 : 1)
+    end
+end