code: function findPositions(getInner, getOuter, thingsToMeasure) {
          var tablePositions = [];
  
          // Skip the first item in the array = no left (LTR), right (RTL) or top bars
          for (var i = 1; i < thingsToMeasure.length; i++) {
            // Get the element from the details
            var item = thingsToMeasure[i].element;
  
            // We need to zero index this again
            tablePositions.push(getInner(i - 1, item));
          }
  
          var lastTableLineToMake = thingsToMeasure[thingsToMeasure.length - 1];
          tablePositions.push(getOuter(thingsToMeasure.length - 1, lastTableLineToMake.element));
  
          return tablePositions;
        }
docs: Find the left/right (ltr/rtl) or top side locations of the cells to measure. This is the location of the borders we need to draw over.