Update bbs/plot_title (#3604)

* add the plot_title

* update plot_title for multiple subplots, fix GR warning

Co-authored-by: Simon Christ <SimonChrist@gmx.de>
Co-authored-by: t-bltg <t-bltg@users.noreply.github.com>

src/pipeline.jl

@@ -286,7 +286,7 @@ function _add_plot_title!(plt)
     plot_title = plt[:plot_title]
     if plot_title != ""
         the_layout = plt.layout
-        plt.layout = grid(2,1, heights = [0.0,1.0])
+        plt.layout = grid(2, 1, heights=(.01, .99))
         plt.layout.grid[2, 1] = the_layout
         subplot = Subplot(backend(), parent = plt.layout[1, 1])
         subplot.plt = plt

src/plot.jl

@@ -159,6 +159,7 @@ function plot!(plt1::Plot, plts_tail::Plot...; kw...)
             cmdidx += 1
         end
     end
+    _add_plot_title!(plt)
 
     # first apply any args for the subplots
     for (idx,sp) in enumerate(plt.subplots)