From e70c30dd13db7d03ef8a3ab2040c842215d1268f Mon Sep 17 00:00:00 2001
From: Giorgio Calderone <giorgio.calderone@gmail.com>
Date: Sun, 5 Dec 2021 15:59:48 +0100
Subject: [PATCH] Handle the case where an implicit recipe returns a
 Vector{PlotElement}

---
 src/Gnuplot.jl | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/src/Gnuplot.jl b/src/Gnuplot.jl
index 18a8057..026ae15 100644
--- a/src/Gnuplot.jl
+++ b/src/Gnuplot.jl
@@ -1125,7 +1125,16 @@ function parseArguments(_args...)
         elseif hasmethod(recipe, tuple(typeof(arg))) # ==> implicit recipe
             # @info which(recipe, tuple(typeof(arg)))  # debug
             deleteat!(args, pos)
-            insert!(args, pos, recipe(arg))
+            pe = recipe(arg)
+            if isa(pe, PlotElement)
+                insert!(args, pos, pe)
+            elseif isa(pe, Vector{PlotElement})
+                for i in 1:length(pe)
+                    insert!(args, pos, pe[i])
+                end
+            else
+                error("Recipe must return a PlotElement or Vector{PlotElement}")
+            end
             continue
         elseif isa(arg, Vector{PlotElement})         # ==> explicit recipe (vector)
             deleteat!(args, pos)