fixup! feat: add discrete variables support to solution plot recipe

src/solutions/solution_interface.jl

@@ -294,23 +294,18 @@ DEFAULT_PLOT_FUNC(x, y, z) = (x, y, z) # For v0.5.2 bug
         ts = ts[tstart:tend]
 
         vals = getp(sol, idx)(sol, tstart:tend)
-
         # Scatterplot of points
-        @series begin
-            seriestype := :scatter
-            linestyle --> :dash
-            label --> string(hasname(idx) ? getname(idx) : idx)
-            ts, vals
-        end
-
         @series begin
             seriestype := :line
             linestyle --> :dash
-            label := nothing
+            markershape --> :o
+            markersize --> repeat([2, 0], length(ts)-1)
+            markeralpha --> repeat([1, 0], length(ts)-1)
+            label --> string(hasname(idx) ? getname(idx) : idx)
 
-            xvals = collect(Iterators.flatten(zip(ts, ts)))[2:end]
-            yvals = collect(Iterators.flatten(zip(vals, vals)))[1:end-1]
-            xvals, yvals
+            x = vec([ts[1:end-1]'; ts[2:end]'])
+            y = repeat(vals, inner=2)[1:end-1]
+            x, y
         end
     end
 end