fix pcp test; fix legend-merge typo, fix single color valuepcp

src/plot_parallelcoordinates.jl

@@ -146,7 +146,13 @@ function parallelplot(f::Union{<:Figure,<:GridPosition,<:GridLayout},
             # categorical colors
             un_c = unique(color)
             color_ix = [findfirst(un_c .==c) for c in color]
-            color = cgrad(colormap,length(un_c))[color_ix]
+            #@assert length(un_c) == 1 "Only single color found, please don't specify color, "
+            if length(un_c) == 1
+                @warn "only a single unique value found in specified color-vec"
+                color = cgrad(colormap,2)[color_ix]
+            else
+                color = cgrad(colormap,length(un_c))[color_ix]
+            end
             #crange = [1,length(unique(color))]
         else
             # continuous color

src/plotconfig.jl

@@ -223,7 +223,7 @@ function PlotConfig(T::Val{:paracoord})
         ),
         legend = (;
             merge = true,
-        )
+        ),
         mapping = (; x = :channel),
     )
     return cfg

test/test_pcp.jl

@@ -2,7 +2,7 @@
 @testset "Figure, 3 channels, 1 condition" begin
     include("../docs/example_data.jl")
     results_plot, positions = example_data();
-    plot_parallelcoordinates(results_plot, [5, 3, 2]; # this selects channel 5,3 & 2 
+    plot_parallelcoordinates(results_plot; # this selects channel 5,3 & 2 
         mapping = (color = :coefname, y = :estimate))
 end
 
@@ -12,7 +12,7 @@ end
     d_singletrial, _ = UnfoldSim.predef_eeg(; return_epoched=true)
 
     f = Figure()
-    plot_parallelcoordinates!(f[1, 1], uf_5chan, [1, 2, 3, 4, 5]; 
-        mapping=(; color=:coefname), layout=(; legend_position=:bottom))
+    plot_parallelcoordinates(f[1, 1], uf_5chan; 
+        mapping=(; color=:coefname), layout=(; legend_position=:bottom));
     f
 end