See steps to reproduce.
This is a regression.
Although the error is only one pixel, the time error could be significant when zoomed out.


The problem is in these lines in DoClipMove(). interval contains the start and end of the clip BEFORE the move.

         auto &intervals = pShifter->MovingIntervals();
         if ( !intervals.empty() ) {
            auto &interval = intervals[0];
            if (newT0 < interval.Start())
               newT0 = interval.Start();
            if (newT0 > interval.End())
               newT0 = interval.End();
            double diff = selectedRegion.duration();
            selectedRegion.setTimes(newT0, newT0 + diff);
         }