Different procedure, same results, to find corresponding tracks...

... for shifting of clips among tracks

But this (temporarily) breaks the behavior of dragging back to the original
clip without first releasing the mouse

src/tracks/playabletrack/wavetrack/ui/WaveTrackView.cpp

@@ -1344,6 +1344,11 @@ public:
 
    bool SyncLocks() override { return true; }
 
+   bool MayMigrateTo(Track &other) override
+   {
+      return TrackShifter::CommonMayMigrateTo(other);
+   }
+
    double HintOffsetLarger(double desiredOffset) override
    {
       // set it to a sample point, and minimum of 1 sample point