preliminary change to avoid unnecessary stuff happening when track drags do not reorder

gtk2_ardour/editor.cc

@@ -6174,6 +6174,7 @@ Editor::maybe_move_tracks ()
 					/* in top half of this track, move spacer */
 					track_drag->bump_track = tv;
 					move_selected_tracks (true);
+					track_drag->did_reorder = true;
 				}
 
 			} else if (track_drag->direction > 0) {
@@ -6183,6 +6184,7 @@ Editor::maybe_move_tracks ()
 				if (track_drag->current > (tv->y_position() + (tv->effective_height() / 2))) {
 					track_drag->bump_track = tv;
 					move_selected_tracks (false);
+					track_drag->did_reorder = true;
 				}
 			}
 

gtk2_ardour/editor.h

@@ -2628,6 +2628,7 @@ private:
 		bool               have_predrag_cursor;
 		int                direction;
 		bool               first_move;
+		bool               did_reorder;
 
 		TrackDrag (RouteTimeAxisView* rtav, ARDOUR::Session& s)
 			: track (rtav)
@@ -2640,6 +2641,7 @@ private:
 			, have_predrag_cursor (false)
 			, direction (0)
 			, first_move (true)
+			, did_reorder (false)
 		{}
 
 	};