Fix plotattributes in _add_plot_title! (#4090)

Co-authored-by: Simon Christ <SimonChrist@gmx.de>

src/args.jl

@@ -2059,7 +2059,7 @@ function _update_subplot_args(
 )
     anns = RecipesPipeline.pop_kw!(sp.attr, :annotations)
 
-    # # grab those args which apply to this subplot
+    # grab those args which apply to this subplot
     for k in keys(_subplot_defaults)
         slice_arg!(plotattributes_in, sp.attr, k, subplot_index, remove_pair)
     end

src/pipeline.jl

@@ -289,6 +289,7 @@ end
 
 function _add_plot_title!(plt)
     plot_title = plt[:plot_title]
+    plot_titleindex = nothing
 
     if plot_title != ""
         # make new subplot for plot title
@@ -319,7 +320,7 @@ function _add_plot_title!(plt)
         end
     end
 
-    return nothing
+    return plot_titleindex
 end
 
 ## Series recipes

src/plot.jl

@@ -163,11 +163,11 @@ function plot!(plt1::Plot, plt2::Plot, plts_tail::Plot...; kw...)
             cmdidx += 1
         end
     end
-    _add_plot_title!(plt)
+    ttl_idx = _add_plot_title!(plt)
 
     # first apply any args for the subplots
     for (idx, sp) in enumerate(plt.subplots)
-        _update_subplot_args(plt, sp, plotattributes, idx, false)
+        _update_subplot_args(plt, sp, idx == ttl_idx ? KW() : plotattributes, idx, false)
     end
 
     # finish up

test/runtests.jl

@@ -37,19 +37,25 @@ end
     Plots.use_local_dependencies[] = temp
 end
 
-include("test_defaults.jl")
-include("test_pipeline.jl")
-include("test_axes.jl")
-include("test_layouts.jl")
-include("test_contours.jl")
-include("test_axis_letter.jl")
-include("test_components.jl")
-include("test_shorthands.jl")
-include("integration_dates.jl")
-include("test_recipes.jl")
-include("test_hdf5plots.jl")
-include("test_pgfplotsx.jl")
-include("test_plotly.jl")
+for fn in (
+    "test_defaults.jl",
+    "test_pipeline.jl",
+    "test_axes.jl",
+    "test_layouts.jl",
+    "test_contours.jl",
+    "test_axis_letter.jl",
+    "test_components.jl",
+    "test_shorthands.jl",
+    "integration_dates.jl",
+    "test_recipes.jl",
+    "test_hdf5plots.jl",
+    "test_pgfplotsx.jl",
+    "test_plotly.jl",
+)
+    @testset "$fn" begin
+        include(fn)
+    end
+end
 
 reference_dir(args...) =
     joinpath(homedir(), ".julia", "dev", "PlotReferenceImages", args...)

test/test_layouts.jl

@@ -25,3 +25,10 @@ end
     @test pl[:plot_title] == "My new title"
     @test pl[:plot_titleindex] == 5
 end
+
+@testset "Plots.jl/issues/4083" begin
+    p = plot(plot(1:2), plot(1:2); border = :grid, plot_title = "abc")
+    @test p[1][:framestyle] === :grid
+    @test p[2][:framestyle] === :grid
+    @test p[3][:framestyle] === :none
+end