anchor.diff:        format.custom.format.fill.color = _underpacingFormatFill;
         format.custom.format.font.color = _underpacingFormatFont;
   
  -      context.sync();
  -
         // All operations are complete.
         formatCompleter.complete();
  +
  +      return context.sync();
       }));
   
       return formatCompleter.future;
  
positive.code: 
        format.custom.format.numberFormat = _currencyFormat;
  
        context.sync();
  
        // All operations are complete.
        formatCompleter.complete();
      }));
  
      return formatCompleter.future;
  
negative.code:       sheet.getUsedRange().getEntireColumn().format.autofitColumns();
        sheet.getUsedRange().getEntireRow().format.autofitRows();
  
        // Sets the sheet as active.
        sheet.activate();
  
        // All operations are complete.
        populateCompleter.complete();
  
        return context.sync();
      }));
  
      // Waits for population to be complete.
  