probes: print cells and column weights; split-row ruler label

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/ui_probe.cpp

@@ -3384,6 +3384,28 @@ gboolean window_probe(gpointer user) {
   return G_SOURCE_REMOVE;
 }
 
+std::string layout_cells_text(const RowSet& rs) {
+  std::string out;
+  for (int fr = 0; fr < rs.figure_row_count(); ++fr) {
+    out += (fr == 0 ? "" : ",") + std::to_string(rs.cells_in_row(fr));
+  }
+  return out;
+}
+
+std::string layout_colweights_text(const RowSet& rs) {
+  std::string out;
+  for (int fr = 0; fr < rs.figure_row_count(); ++fr) {
+    if (fr != 0) out += "|";
+    const std::vector<float>& w = rs.cell_weights(fr);
+    for (std::size_t k = 0; k < w.size(); ++k) {
+      char buf[32];
+      std::snprintf(buf, sizeof(buf), "%s%g", k == 0 ? "" : ",", static_cast<double>(w[k]));
+      out += buf;
+    }
+  }
+  return out;
+}
+
 void layout_probe_report(App& a, const char* what) {
   const int rows = a.rows->row_count();
   const double scale = (a.area != nullptr && a.area->device_scale() > 0.0f)
@@ -3459,7 +3481,8 @@ void layout_probe_report(App& a, const char* what) {
     }
   }
   std::fprintf(stderr, "[layout-probe] %-12s rows=%d buttons=%zu done=%d done_box=[%s] "
-                       "rows_y=[%s] close=[%s] add=[%s] resize=[%s] traces=[%s] side_w=%d\n",
+                       "rows_y=[%s] close=[%s] add=[%s] resize=[%s] traces=[%s] side_w=%d cells=[%s] "
+                       "colweights=[%s]\n",
                what, rows, a.layout_buttons.size(), a.layout_done_button != nullptr ? 1 : 0,
                done_box.c_str(), geom.c_str(), close_tops.c_str(), add_tops.c_str(),
                resize_tops.c_str(),
@@ -3467,7 +3490,8 @@ void layout_probe_report(App& a, const char* what) {
                // The sidebar, which is the pane a divider position can silently take away: `side_w`
                // must be its own request (320) rather than 0, and `divider` the position the window's
                // width less the sidebar's column left it at.
-               a.side_box != nullptr ? gtk_widget_get_width(a.side_box) : -1);
+               a.side_box != nullptr ? gtk_widget_get_width(a.side_box) : -1,
+               layout_cells_text(*a.rows).c_str(), layout_colweights_text(*a.rows).c_str());
   std::fflush(stderr);
 }
 
@@ -4323,9 +4347,32 @@ gboolean split_probe_step(gpointer user) {
       split_probe_next(*a);
       break;
     }
-    case 18:
+    case 18: {
       split_probe_report(*a, "after-assign");
+      // The cursors pane's ruler labels (`rebuild_cursors_pane()`, ruler modes): a plot of a split row is
+      // "plot <label>", a plot of an unsplit row keeps "row <index>". Both arrangements are read off the
+      // pane's own label widgets, the all-split one first and a mixed one second.
+      const RowSet::CursorMode was_mode = rs.cursor_mode();
+      rs.set_cursor_mode(RowSet::CursorMode::Both);
+      const auto ruler_labels = [&]() {
+        rebuild_cursors_pane(*a);
+        std::string out;
+        for (const App::CursorLine& line : a->cursors_lines) {
+          if (line.slot != -1 || line.label == nullptr) continue;
+          out += (out.empty() ? "" : ",") + std::string(gtk_label_get_text(GTK_LABEL(line.label)));
+        }
+        return out;
+      };
+      const std::string split_labels = ruler_labels();
+      rs.set_cells_per_row({1, 2});
+      split_probe_restructured(*a);
+      const std::string mixed_labels = ruler_labels();
+      std::fprintf(stderr, "[split-probe] ruler-labels    split=[%s] mixed=[%s]\n", split_labels.c_str(),
+                   mixed_labels.c_str());
+      rs.set_cursor_mode(was_mode);
+      rebuild_cursors_pane(*a);
       break;
+    }
     default:
       break;
   }