acquisition: drive a DataSource from the registry; --source and --source-opt

src/ui.cpp

@@ -2494,7 +2494,7 @@ void on_about_clicked(GtkButton*, gpointer user) {
   App* app = static_cast<App*>(user);
   close_overflow_menu(*app);
   show_about(GTK_WINDOW(app->window),
-             layout_path(app->model->config().server, app->model->config().port));
+             layout_path(app->model->config().session_host(), app->model->config().session_port()));
 }
 
 void on_help_clicked(GtkButton*, gpointer user) {
@@ -5914,8 +5914,8 @@ int run_ui(int argc, char** argv, const Config& cfg, ScopeModel& model, Acquisit
   // both overrode the arrangement the file was opened with and could clobber a real session. With no
   // port, `save_layout_now()` refuses and the first-CONFIG layout load never runs, which is exactly
   // a source-less run.
-  app.source_host = cfg.open_waveform.empty() ? cfg.server : std::string();
-  app.source_port = cfg.open_waveform.empty() ? cfg.port : 0;
+  app.source_host = cfg.open_waveform.empty() ? cfg.session_host() : std::string();
+  app.source_port = cfg.open_waveform.empty() ? cfg.session_port() : 0;
   app.source_multicast = cfg.open_waveform.empty() ? cfg.multicast : std::string();
   app.source_interface = cfg.interface_addr;
   // The event cache is keyed on the source, like the packet capture. A waveform has no source, so a