Fixed triggering mode change when acquiring

src/plot_host.hpp

@@ -117,10 +117,13 @@ class RowSet {
   /// The channel index a row/slot holds, or -1.
   int channel_of(int row, int slot) const;
 
-  /// Rebinds every slot to what it should show this frame: the model's live buffer,
-  /// or -- in trigger mode -- the captured event. Called every frame, because the
-  /// channel list is renumbered by any structural change.
-  void bind(ScopeModel& model);
+  /// Rebinds every slot to what `mode` says it should show this frame. Called every
+  /// frame, because the channel list is renumbered by any structural change.
+  ///
+  /// `mode` is passed in rather than read from the model, so that one frame's bind, axis
+  /// and status line all describe the same display: the producer can open or close a
+  /// capture between any two reads of `ScopeModel::display_mode()`.
+  void bind(ScopeModel& model, DisplayMode mode);
   /// Publishes the live buffer's new samples.
   void acquire(ScopeModel& model) { model.acquire_all(); }