improved measuraments ,cursors, zooming and user interactions

src/export.cpp

@@ -103,8 +103,10 @@ ExportTable collect_export(ScopeModel& model, RowSet& rows) {
   // otherwise -- including mid-capture, where the rows follow the live ring too. Reading
   // the ring while an event is on screen would export data the user cannot see, and
   // reading the stale snapshot mid-capture would export the *previous* event.
-  std::shared_ptr<const EventSnapshot> snap = model.event();
-  if (model.display_mode() == DisplayMode::Held && snap != nullptr) {
+  // What is on screen: a pause's frozen view, or the trigger's held event. Both are immutable
+  // snapshots, so the export is the picture the user is looking at either way.
+  std::shared_ptr<const EventSnapshot> snap = model.display_snapshot();
+  if (snap != nullptr) {
     // The snapshot is immutable and already index-aligned, so the visible window is two
     // binary searches over its stamps and the same index range for every channel.
     const std::vector<f32>& st = snap->stamps;