fix(plot): a figure row's strip shows labels and title independently, and the shared axis is the bottom row's strip

include/plot/render/renderer.hpp

@@ -140,11 +140,12 @@ class Renderer {
   /// exactly as a stand-alone plot is, and `draw(Plot&)` itself is unchanged for
   /// single-plot hosts.
 
-  /// The shared axis is the frame's last text: when the figure says labels belong on
-  /// the bottom only (the default), the rows reserved no x label strip of their own
-  /// and the labels of the last row's x axes are staged once, in the strip
-  /// `FigureLayout::x_axis_strip` measured, under the last row. With that switched
-  /// off, every row draws its own labels and this draws no shared axis at all.
+  /// The figure's one shared x axis is the **bottom row's own**, so it is drawn by
+  /// that row's normal path: when the figure says labels belong on the bottom only
+  /// (the default), the rows above reserve no x chrome and the bottom row stages its
+  /// own labels and title once, inside its own strip -- the rect
+  /// `FigureLayout::x_axis_strip` reads back. With that switched off, every row keeps
+  /// its own chrome and each draws its own labels; there is then no shared axis.
 
   /// Styling, the text backend and `ui_scale` are installed on **every** row before
   /// the figure computes its layout, so the strips the rows measure and the strokes
@@ -363,11 +364,6 @@ class Renderer {
   /// ticks, the strips and the grid, so it is computed once, in `draw()`, and handed
   /// down -- never re-derived per helper.
   void draw_tick_labels(const Plot& plot, const PlotLayout& layout);
-  /// The x tick labels of every x axis of `plot`, centred on their ticks in `strip`:
-  /// what `draw_tick_labels()` uses with the plot's own `x_label_area`, and what
-  /// `draw(Figure&)` uses with the figure's shared strip -- one rule for a plot's
-  /// labels and a figure's, so the two can never place a label differently.
-  void draw_x_tick_labels(const Plot& plot, const Rect& strip);
   void draw_titles(const Plot& plot, const PlotLayout& layout);
   /// The data helpers take it too; they read the axes rect and the transforms it
   /// pins.