fix some region-view level selection issues

gtk2_ardour/midi_region_view.cc

@@ -749,3 +749,37 @@ MidiRegionView::drag_group () const
 {
 	return get_canvas_group ();
 }
+
+void
+MidiRegionView::select_self (bool  add)
+{
+	if (add) {
+		_editing_context.get_selection().add (this);
+	} else {
+		_editing_context.get_selection().set (this);
+	}
+}
+
+void
+MidiRegionView::unselect_self ()
+{
+	_editing_context.get_selection().remove (this);
+}
+
+void
+MidiRegionView::begin_drag_edit (std::string const & why)
+{
+	if (!_selected) {
+		/* unclear why gcc can't understand which version of
+		   select_self() to use here, but so be it.
+		*/
+		MidiView::select_self ();
+	}
+	// start_note_diff_command (why);
+}
+
+void
+MidiRegionView::select_self_uniquely ()
+{
+	_editing_context.set_selected_midi_region_view (*this);
+}

gtk2_ardour/midi_region_view.h

@@ -126,6 +126,10 @@ public:
 	void redisplay (bool);
 
 	ArdourCanvas::Item* drag_group() const;
+	void select_self (bool add);
+	void unselect_self ();
+	void select_self_uniquely ();
+	void begin_drag_edit (std::string const & why);
 
   protected:
 	void reset_width_dependent_items (double pixel_width);

gtk2_ardour/midi_view.cc

@@ -113,9 +113,9 @@ MidiView::MidiView (std::shared_ptr<MidiTrack> mt,
 	: _midi_track (mt)
 	, _editing_context (ec)
 	, _midi_context (bg)
-	, _active_notes(0)
+	, _active_notes (0)
 	, _note_group (new ArdourCanvas::Container (&parent))
-	, _note_diff_command (0)
+	, _note_diff_command (nullptr)
 	, _ghost_note(0)
 	, _step_edit_cursor (0)
 	, _step_edit_cursor_width (1, 0)
@@ -123,7 +123,7 @@ MidiView::MidiView (std::shared_ptr<MidiTrack> mt,
 	, _mouse_state(None)
 	, _pressed_button(0)
 	, _optimization_iterator (_events.end())
-	, _list_editor (0)
+	, _list_editor (nullptr)
 	, _no_sound_notes (false)
 	, _last_display_zoom (0)
 	, _last_event_x (0)
@@ -2066,7 +2066,7 @@ void
 MidiView::clear_note_selection ()
 {
 	clear_selection_internal ();
-	// XXXX _editing_context.get_selection().remove (this);
+	unselect_self ();
 }
 
 void
@@ -2403,7 +2403,7 @@ MidiView::remove_from_selection (NoteBase* ev)
 	ghost_sync_selection (ev);
 
 	if (_selection.empty()) {
-		// XXXX _editing_context.get_selection().remove (this);
+		unselect_self ();
 	}
 }
 
@@ -2428,7 +2428,7 @@ MidiView::add_to_selection (NoteBase* ev)
 		 * only apply to notes anyway, not regions.
 		 */
 
-		// XXX _editing_context.set_selected_midi_region_view (*this);
+		select_self_uniquely ();
 	}
 
 	if (_selection.insert (ev).second == true) {
@@ -3173,8 +3173,6 @@ MidiView::change_note_length (NoteBase* event, Temporal::Beats t)
 void
 MidiView::begin_drag_edit (std::string const & why)
 {
-	// XXXX _editing_context.get_selection().set (this, true);
-	start_note_diff_command (why);
 }
 
 void
@@ -4079,7 +4077,7 @@ MidiView::maybe_select_by_position (GdkEventButton* ev, double /*x*/, double y)
 	}
 
 	if (add_mrv_selection) {
-		// XXXXX _editing_context.get_selection().add (this);
+		select_self (true);
 	}
 }
 

gtk2_ardour/midi_view.h

@@ -173,7 +173,7 @@ class MidiView : public virtual sigc::trackable
 	void end_write();
 	void extend_active_notes();
 
-	void begin_drag_edit (std::string const & why);
+	virtual void begin_drag_edit (std::string const & why);
 	void end_drag_edit ();
 
 	void display_model(std::shared_ptr<ARDOUR::MidiModel> model);
@@ -332,6 +332,11 @@ class MidiView : public virtual sigc::trackable
 	EditingContext& editing_context() const { return _editing_context; }
 	MidiViewBackground& midi_context() const { return _midi_context; }
 
+	virtual void select_self (bool add) {}
+	virtual void unselect_self () {}
+	void select_self () { select_self (false); }
+	virtual void select_self_uniquely () {}
+
   protected:
 	void init ();
 	virtual void region_resized (const PBD::PropertyChange&);

gtk2_ardour/selection.cc

@@ -1622,8 +1622,8 @@ Selection::midi_regions ()
 {
 	MidiRegionSelection ms;
 
-	for (RegionSelection::iterator i = regions.begin(); i != regions.end(); ++i) {
-		MidiRegionView* mrv = dynamic_cast<MidiRegionView*>(*i);
+	for (auto & r : regions) {
+		MidiRegionView* mrv = dynamic_cast<MidiRegionView*>(r);
 		if (mrv) {
 			ms.add (mrv);
 		}