do not plot legend upon single series

.github/workflows/reference_images.yml

@@ -0,0 +1,44 @@
+name: Update reference images
+
+on:
+  workflow_dispatch:
+
+jobs:
+  build:
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          repository: JuliaPlots/PlotDocs.jl
+          token: ${{ secrets.PLOTS_REFIMAGES_TOKEN }}
+      - uses: julia-actions/setup-julia@latest
+        with:
+          version: "1"
+      - name: Cache artifacts
+        uses: actions/cache@v4
+        env:
+          cache-name: cache-artifacts
+        with:
+          path: ~/.julia/artifacts 
+          key: ${{runner.os}}-test-${{env.cache-name}}-${{hashFiles('**/Project.toml')}}
+          restore-keys: |
+            ${{runner.os}}-test-${{env.cache-name}}-
+            ${{runner.os}}-test-
+            ${{runner.os}}-
+      - name: Run Plots tests
+        env:
+          PLOTSBASE_TEST_PACKAGES: GR
+          VISUAL_REGRESSION_TESTS_AUTO: true
+        shell: julia --color=yes {0}
+        run: |
+          using Pkg
+          gh_ref = ${{ github.ref_name }}
+          @info "Adding Plots#$gh_ref"
+          Pkg.add(PackageSpec(name="Plots", rev="$gh_ref"))
+          Pkg.test("Plots")
+      - name: Create pull request
+        uses: peter-evans/create-pull-request@v7
+        with:
+          title: "Update Plot reference images from branch ${{ github.ref_name}} by the action ${{ github.workflow_ref }}"
+          body: "Review changes thoroughly and only merge when no unwanted chages are present."
+          token: ${{ secrets.PLOTS_REFIMAGES_TOKEN }}

GraphRecipes/test/runtests.jl

@@ -30,23 +30,23 @@ default(show = false, reuse = true)
         method ≡ :spectral && continue  # FIXME
         dat = if (inp = GraphRecipes._graph_inputs[method]) ≡ :adjmat
             [
-                0 1 1;
-                1 0 1;
+                0 1 1
+                1 0 1
                 1 1 0
             ]
         elseif inp ≡ :sourcedestiny
             Symmetric(sparse(rand(rng, 0:1, 8, 8)))
         elseif inp ≡ :adjlist
             dat = [
-                0 1 1 0 0 0 0 0 0 0;
-                0 0 0 0 1 1 0 0 0 0;
-                0 0 0 1 0 0 1 0 1 0;
-                0 0 0 0 0 0 0 0 0 0;
-                0 0 0 0 0 0 0 1 0 1;
-                0 0 0 0 0 0 0 0 0 0;
-                0 0 0 0 0 0 0 0 0 0;
-                0 0 0 0 0 0 0 0 0 0;
-                0 0 0 0 0 0 0 0 0 0;
+                0 1 1 0 0 0 0 0 0 0
+                0 0 0 0 1 1 0 0 0 0
+                0 0 0 1 0 0 1 0 1 0
+                0 0 0 0 0 0 0 0 0 0
+                0 0 0 0 0 0 0 1 0 1
+                0 0 0 0 0 0 0 0 0 0
+                0 0 0 0 0 0 0 0 0 0
+                0 0 0 0 0 0 0 0 0 0
+                0 0 0 0 0 0 0 0 0 0
                 0 0 0 0 0 0 0 0 0 0
             ]
         else

NEWS.md

@@ -8,15 +8,18 @@
 
 - deprecated backends `pgfplots` and `pyplot` removed
 - deprecated keyword `orientation` removed
-- backends are extensions now so the backend code must be explicitly loaded using `import` with the backend package, e.g. ```julia
-using Plots
-import GR # loads backend code
+- backends are extensions now so the backend code must be explicitly loaded using `import` with the backend package, e.g. 
+    ```julia
+    using Plots
+    import GR # loads backend code
 
-```
+    ```
 - Types are no longer part of the Plots API this affects
   - `Shape`, which is now `shape`
+- The default `label` is now `:none`, use `:auto` to restore the previous behaviour
 
 ---
+
 #### notes on release changes, ongoing development, and future planned work
 
 ## NOTE: this file is deprecated, see the [TagBot](https://github.com/marketplace/actions/julia-tagbot) auto-generated changelogs instead

PlotsBase/ext/GRExt.jl

@@ -2033,7 +2033,7 @@ function gr_draw_segments(series, x, y, z, fillrange, clims)
                 series[:arrow] isa Arrow ? series[:arrow] : Arrow(:none, :simple, 1.0, 1.0)
 
             arrowside, arrowstyle, arrowsize =
-                arrow.side, arrow.style, (arrow.headlength+arrow.headwidth)/2
+                arrow.side, arrow.style, (arrow.headlength + arrow.headwidth) / 2
 
             gr_polyline(x[rng], y[rng]; arrowside, arrowstyle, arrowsize)
         end

PlotsBase/src/Commons/attrs.jl

@@ -325,7 +325,7 @@ const _bar_width = 0.8
 # -----------------------------------------------------------------------------
 
 const _series_defaults = KW(
-    :label              => :auto,
+    :label              => :none,
     :colorbar_entry     => true,
     :seriescolor        => :auto,
     :seriesalpha        => nothing,

PlotsBase/src/DF.jl

@@ -105,7 +105,7 @@ function parse_table_call!(d, x::Expr, syms, vars)
         new_ex = Expr(:tuple, x.args...)
 
         for (j, field_in_NT) ∈ enumerate(new_ex.args)
-            if isa(field_in_NT, Expr) && field_in_NT.head==:(=)
+            if isa(field_in_NT, Expr) && field_in_NT.head == :(=)
                 new_ex.args[j] = Expr(:(=), field_in_NT.args...)
             elseif field_in_NT isa QuoteNode
                 new_ex.args[j] = Expr(:(=), field_in_NT.value, field_in_NT)

PlotsBase/test/test_args.jl

@@ -33,12 +33,14 @@ end
 end
 
 @testset "Series Attributes" begin
-    pl = plot([[1, 2, 3], [2, 3, 4]], lw = 5)
-    @test hline!(deepcopy(pl), [1.75])[1].series_list[3][:label] ==
-          hline!(deepcopy(pl), [1.75], z_order = :front)[1].series_list[3][:label] ==
+    pl = plot([[1, 2, 3], [2, 3, 4]], lw = 5, label = :auto)
+    @test hline!(deepcopy(pl), [1.75], label = :auto)[1].series_list[3][:label] ==
+          hline!(deepcopy(pl), [1.75], z_order = :front, label = :auto)[1].series_list[3][:label] ==
+          "y3"
+    @test hline!(deepcopy(pl), [1.75], z_order = :back, label = :auto)[1].series_list[1][:label] ==
+          "y3"
+    @test hline!(deepcopy(pl), [1.75], z_order = 2, label = :auto)[1].series_list[2][:label] ==
           "y3"
-    @test hline!(deepcopy(pl), [1.75], z_order = :back)[1].series_list[1][:label] == "y3"
-    @test hline!(deepcopy(pl), [1.75], z_order = 2)[1].series_list[2][:label] == "y3"
     sp = pl[1]
     @test isempty(sp[1][:extra_kwargs])
     @test sp[2][:series_index] == 2

PlotsBase/test/test_misc.jl

@@ -329,7 +329,7 @@ with(:gr) do
         @test plot([0:1 reverse(0:1)]; labels = ["a" "b"], leg = (0.5, :inner)) isa
               PlotsBase.Plot
         @test_logs (:warn, r"n° of legend_column.*") png(
-            plot(1:2, legend_columns = 10),
+            plot(1:2, legend_columns = 10, label = :auto),
             tempname(),
         )
     end

PlotsBase/test/test_pgfplotsx.jl

@@ -28,7 +28,7 @@ with(:pgfplotsx) do
 
     @testset "Legends" begin
         pl = plot(rand(5, 2), lab = ["1" ""], arrow = true)
-        scatter!(pl, rand(5))
+        scatter!(pl, rand(5), label = :auto)
         axis_contents = first(get_pgf_axes(pl)).contents
         leg_entries = filter(x -> x isa PGFPlotsX.LegendEntry, axis_contents)
         series = filter(x -> x isa PGFPlotsX.Plot, axis_contents)
@@ -93,8 +93,8 @@ with(:pgfplotsx) do
     end
 
     @testset "Plot in pieces" begin
-        pl = plot(rand(100) / 3, reg = true, fill = (0, :green))
-        scatter!(pl, rand(100), markersize = 6, c = :orange)
+        pl = plot(rand(100) / 3, reg = true, fill = (0, :green), label = :auto)
+        scatter!(pl, rand(100), markersize = 6, c = :orange, label = :auto)
         axis_contents = first(get_pgf_axes(pl)).contents
         leg_entries = filter(x -> x isa PGFPlotsX.LegendEntry, axis_contents)
         series = filter(x -> x isa PGFPlotsX.Plot, axis_contents)