ui: one way to open the events page, and stale wording after the pane's removal

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

src/ui_probe.cpp

@@ -5674,7 +5674,7 @@ gboolean events_probe_step(gpointer user) {
       gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(a->trigger_toggle), TRUE);
     }
     report_events_availability(*a, "after trigger on");
-    slideover_open(*a, "events");
+    open_events_page(*a);
     // Read straight after the open, before anything else can call the availability rule.
     report_events_availability(*a, "after events page opened");
     // ... and again a few frames later, still with no replay in the way: this is the *open alone*
@@ -5747,11 +5747,15 @@ gboolean events_probe_step(gpointer user) {
                    r.stem.c_str(), r.duration_s, r.pre_s, r.post_s, r.edge, r.signals, r.samples,
                    r.rate_hz, static_cast<unsigned long long>(r.seq), thumb_bytes,
                    a->event_recording ? 1 : 0, slideover_page(*a) == "events" ? 1 : 0);
-      // The first latch must not have moved the plot: the list is a slide-over page over the plot's
-      // edge, and the dock is a fixed column, so nothing about an event changes the plot's width.
+    }
+    // The first latch must not have moved the plot: the list is a slide-over page over the plot's
+    // edge, and the dock is a fixed column, so nothing about an event changes the plot's width. Both
+    // widths must be real (> 0): two unrealised -1s are equal and would read as stable.
+    {
       const int plot_w_now = a->area_widget != nullptr ? gtk_widget_get_width(a->area_widget) : -1;
-      std::fprintf(stderr, " plot_w_stable=%d plot_w=%d/%d", plot_w_now == a->dbg_events_plot_w ? 1 : 0,
-                   a->dbg_events_plot_w, plot_w_now);
+      std::fprintf(stderr, " plot_w_stable=%d plot_w=%d/%d",
+                   (plot_w_now > 0 && plot_w_now == a->dbg_events_plot_w) ? 1 : 0, a->dbg_events_plot_w,
+                   plot_w_now);
     }
     std::fprintf(stderr, "\n");
     std::fflush(stderr);
@@ -5898,10 +5902,7 @@ gboolean events_group_probe_step(gpointer user) {
     a->dbg_events_wait = 0;
     // Open the page first: its list is only rebuilt while the page is *open* (or by the Manage button), so
     // a selection made against a closed page selects rows that are not current.
-    if (slideover_page(*a) != "events") {
-      refresh_events_pane(*a);
-      slideover_open(*a, "events");
-    }
+    open_events_page(*a);
     // The selection *is* the input, so select the two newest rows the way a user does and press the
     // button: `on_group_clicked()` reads the list, not a parameter.
     GtkListBox* list = GTK_LIST_BOX(a->events_list);