restore non-allocating generator - bump coverage

[t-bltg]

• per bump cov - more PyPlot exs #4469 (comment);
• add hatched example (after Add hatched fill for GR and PyPlot #3107);
• add GRViewport and corresponding methods for better readability;
• another bump in coverage cycle (targeting at least 90%);
• syntax, simplifications.

I've used a named tuple with Refs in _update_min_padding! since RefField is not implemented yet (see JuliaLang/julia#35453).

extra checks:

• docs build
• benchmarks

batch

main() = begin
  for i in 1:62
    script = """
    using Logging, BenchmarkTools, Plots
    ex(i) = begin
      pl = Plots.test_examples(:gr, i, disp=false)
      Plots.png(pl, "gr-$i")
      Plots.pdf(pl, "gr-$i")
      nothing
    end
    with_logger(true ? NullLogger() : current_logger()) do
      i = parse(Int, first(ARGS))
      Plots._examples[i].imports === nothing || exit(0)
      print("$(lpad(i, 2)))")
      if true
        @btime ex($i) samples = 1 evals = 1  # 1 warmup + 1 eval
      else
        b = @benchmarkable ex($i)
        t = run(b, samples = 10)
        show(IOContext(stdout, :compact => false), t)
        println()
      end
    end
    """
    run(`$(Base.julia_cmd()) -e $script $i`)
  end
end

main()

1.35.5

PR

[codecov]

Codecov Report

Base: 88.32% // Head: 89.64% // Increases project coverage by +1.31% 🎉

Coverage data is based on head (248975d) compared to base (79d873a).
Patch coverage: 89.43% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4470      +/-   ##
==========================================
+ Coverage   88.32%   89.64%   +1.31%     
==========================================
  Files          40       40              
  Lines        7863     7656     -207     
==========================================
- Hits         6945     6863      -82     
+ Misses        918      793     -125     

Impacted Files	Coverage Δ
RecipesBase/src/RecipesBase.jl	90.65% <0.00%> (ø)
RecipesPipeline/src/series_recipe.jl	93.10% <0.00%> (ø)
src/backends/hdf5.jl	84.50% <0.00%> (ø)
src/examples.jl	98.33% <ø> (ø)
src/components.jl	89.81% <25.00%> (-0.27%)	⬇️
src/output.jl	95.57% <50.00%> (+12.09%)	⬆️
src/recipes.jl	81.19% <56.25%> (+1.49%)	⬆️
src/args.jl	84.31% <74.35%> (+0.15%)	⬆️
src/backends/unicodeplots.jl	96.63% <80.00%> (+0.44%)	⬆️
src/pipeline.jl	96.04% <88.23%> (-0.08%)	⬇️
... and 26 more

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