Don't add history by clicking a control point, fix control point selection.

- also make set_selected_control_point_from_click () return
	  something useful.

gtk2_ardour/editor_drag.cc

@@ -4035,6 +4035,7 @@ ControlPointDrag::ControlPointDrag (Editor* e, ArdourCanvas::Item* i)
 	: Drag (e, i),
 	  _cumulative_x_drag (0),
 	  _cumulative_y_drag (0)
+	, _first_move (true)
 {
 	if (_zero_gain_fraction < 0.0) {
 		_zero_gain_fraction = gain_to_slider_position_with_max (dB_to_coefficient (0.0), Config->get_max_gain());
@@ -4061,9 +4062,6 @@ ControlPointDrag::start_grab (GdkEvent* event, Gdk::Cursor* /*cursor*/)
 	setup_snap_delta (pos);
 
 	float const fraction = 1 - (_point->get_y() / _point->line().height());
-	_editor->begin_reversible_command (_("automation event move"));
-	_point->line().start_drag_single (_point, _fixed_grab_x, fraction);
-
 	show_verbose_cursor_text (_point->line().get_verbose_cursor_string (fraction));
 
 	_pushing = Keyboard::modifier_state_equals (event->button.state, ArdourKeyboard::push_points_modifier ());
@@ -4123,6 +4121,12 @@ ControlPointDrag::motion (GdkEvent* event, bool)
 
 	float const fraction = 1.0 - (cy / _point->line().height());
 
+	if (_first_move) {
+		_editor->begin_reversible_command (_("automation event move"));
+		_point->line().start_drag_single (_point, _fixed_grab_x, fraction);
+		_first_move = false;
+	}
+
 	_point->line().drag_motion (_editor->sample_to_pixel_unrounded (cx_frames), fraction, false, _pushing, _final_index);
 
 	show_verbose_cursor_text (_point->line().get_verbose_cursor_string (fraction));
@@ -4142,8 +4146,10 @@ ControlPointDrag::finished (GdkEvent* event, bool movement_occurred)
 		motion (event, false);
 	}
 
-	_point->line().end_drag (_pushing, _final_index);
+	if (!_first_move) {
-	_editor->commit_reversible_command ();
+		_point->line().end_drag (_pushing, _final_index);
+		_editor->commit_reversible_command ();
+	}
 }
 
 void

gtk2_ardour/editor_drag.h

@@ -834,6 +834,7 @@ private:
 	double _fixed_grab_y;
 	double _cumulative_x_drag;
 	double _cumulative_y_drag;
+	bool   _first_move;
         bool     _pushing;
         uint32_t _final_index;
 	static double _zero_gain_fraction;

gtk2_ardour/editor_mouse.cc

@@ -512,7 +512,8 @@ Editor::button_selection (ArdourCanvas::Item* /*item*/, GdkEvent* event, ItemTyp
 		break;
 
 	case ControlPointItem:
-		set_selected_track_as_side_effect (op);
+		/* for object/track exclusivity, we don't call set_selected_track_as_side_effect (op); */
+
 		if (eff_mouse_mode != MouseRange) {
 			_mouse_changed_selection |= set_selected_control_point_from_click (press, op);
 		}

gtk2_ardour/editor_selection.cc

@@ -325,19 +325,23 @@ Editor::set_selected_control_point_from_click (bool press, Selection::Operation
 	if (!clicked_control_point) {
 		return false;
 	}
+	bool ret = false;
 
 	switch (op) {
 	case Selection::Set:
 		if (press) {
 			selection->set (clicked_control_point);
+			ret = true;
 		}
 		break;
 	case Selection::Add:
 		if (press) {
 			selection->add (clicked_control_point);
+			ret = true;
 		}
 		break;
 	case Selection::Toggle:
+
 		/* This is a bit of a hack; if we Primary-Click-Drag a control
 		   point (for push drag) we want the point we clicked on to be
 		   selected, otherwise we end up confusingly dragging an
@@ -352,9 +356,11 @@ Editor::set_selected_control_point_from_click (bool press, Selection::Operation
 			*/
 			selection->toggle (clicked_control_point);
 			_control_point_toggled_on_press = true;
+			ret = true;
 		} else if (!press && !_control_point_toggled_on_press) {
 			/* This is the release, and the point wasn't toggled on the press, so do it now */
 			selection->toggle (clicked_control_point);
+			ret = true;
 		} else {
 			/* Reset our flag */
 			_control_point_toggled_on_press = false;
@@ -365,7 +371,7 @@ Editor::set_selected_control_point_from_click (bool press, Selection::Operation
 		break;
 	}
 
-	return true;
+	return ret;
 }
 
 void