Remove unused condition (MIDI calibration starts engine)

MIDI latency calibration is now only possible when the engine
is running (since 4c8f562053).

This reverts part of e6febe040a
and a2f7abc70b

gtk2_ardour/engine_dialog.cc

@@ -115,7 +115,6 @@ EngineControl::EngineControl ()
 	, queue_device_changed (false)
 	, _have_control (true)
 	, block_signals(0)
-	, _was_calibrating_midi (false)
 {
 	using namespace Notebook_Helpers;
 	vector<string> backend_names;
@@ -3000,20 +2999,6 @@ EngineControl::on_switch_page (GtkNotebookPage*, guint page_num)
 			end_latency_detection ();
 		}
 	}
-
-	/* after latency calibration the engine is running, continue to load session.
-	 * RESPONSE_OK is a NO-OP when the dialog is displayed as Window
-	 * from a running instance.
-	 */
-	if (page_num == 0) {
-		if (_have_control && _was_calibrating_midi && ARDOUR::AudioEngine::instance()->running()) {
-			boost::shared_ptr<ARDOUR::AudioBackend> backend = ARDOUR::AudioEngine::instance()->current_backend();
-			if (backend && backend->can_change_systemic_latency_when_running ()) {
-				response (RESPONSE_OK);
-			}
-		}
-		_was_calibrating_midi = false;
-	}
 }
 
 /* latency measurement */
@@ -3228,7 +3213,6 @@ EngineControl::use_latency_button_clicked ()
 		if (backend->can_change_systemic_latency_when_running ()) {
 			backend->set_systemic_midi_input_latency (_measure_midi->name, one_way);
 			backend->set_systemic_midi_output_latency (_measure_midi->name, one_way);
-			_was_calibrating_midi = true;
 		}
 		notebook.set_current_page (midi_tab);
 	} else {

gtk2_ardour/engine_dialog.h

@@ -377,7 +377,6 @@ private:
 	void midi_latency_adjustment_changed(Gtk::Adjustment *, MidiDeviceSettings, bool);
 	void midi_device_enabled_toggled(ArdourWidgets::ArdourButton *, MidiDeviceSettings);
 	sigc::connection lm_back_button_signal;
-	bool _was_calibrating_midi;
 };
 
 #endif /* __gtk2_ardour_engine_dialog_h__ */