}

      /* Find the "root" of the branch.  The root is a different branch
      ** from which the pRow branch emerges.  There might not be a root
      ** if the pRow branch started off the bottom of the screen.
      */
      for(pRoot=pBottom->pNext; pRoot; pRoot=pRoot->pNext){
        if( pRoot->aiRiser[iFrom]>=0 ) break;
        if( pRoot->aiRiser[iFrom]==pBottom->idx ) break;
      }
      if( pRoot && pRoot->iRail==iTo ){
        /* The parent branch from which this branch emerges is on the
        ** same rail as pRow.  Do not shift as that would stack a child
        ** branch directly above its parent. */
        continue;
      }