+void Tracks::move_tracks(Track *src, Track *dst, int n)
+{
+ if( src == dst ) return;
+ while( --n >= 0 && src ) {
+ Track *nxt = src->next;
+ change_modules(number_of(src), total(), 0);
+ for( Track *track=nxt; track; track=track->next )
+ change_modules(number_of(track), number_of(track)-1, 0);
+ remove_pointer(src);
+ int ndst = dst ? number_of(dst) : total();
+ insert_before(dst, src);
+ for( Track *track=last; track && track!=src; track=track->previous )
+ change_modules(number_of(track)-1, number_of(track), 0);
+ change_modules(total(), ndst, 0);
+ src = nxt;
+ }
+}
+