change gr legend marker for ribbon

src/backends/gr.jl

@@ -1049,7 +1049,7 @@ function gr_display(sp::Subplot{GRBackend}, w, h, viewport_canvas)
                 should_add_to_legend(series) || continue
                 st = series[:seriestype]
                 gr_set_line(series[:linewidth], series[:linestyle], series[:linecolor]) #, series[:linealpha])
-                if st == :path && series[:fillrange] == nothing
+                if st == :path && (series[:fillrange] == nothing || has_ribbon(series))
                     GR.polyline([xpos - 0.07, xpos - 0.01], [ypos, ypos])
                 elseif st == :shape || series[:fillrange] != nothing
                     gr_set_fill(series[:fillcolor]) #, series[:fillalpha])

src/utils.jl

@@ -493,10 +493,16 @@ function make_fillrange_from_ribbon(kw::KW)
     y, rib = kw[:y], kw[:ribbon]
     rib = wraptuple(rib)
     rib1, rib2 = -first(rib), last(rib)
-    kw[:ribbon] = nothing
+    # kw[:ribbon] = nothing
     kw[:fillrange] = make_fillrange_side(y, rib1), make_fillrange_side(y, rib2)
 end
 
+# check if series has a ribbon
+function has_ribbon(series::Series)
+    series[:ribbon] == nothing && return false
+    return series[:ribbon] > 0
+end
+
 function get_sp_lims(sp::Subplot, letter::Symbol)
     axis_limits(sp[Symbol(letter, :axis)])
 end