Increase performance of many DuplicateRow calls

[AbraaoAlves]

Description

File.DuplicateRow is a useful method for keep format and styles, but it can be worst if you need to work/duplicate more than 1k rows.

Describe the results you received:

If you run inside a loop 1000 times, File.DuplicateRow can spend 5-6s If you run inside a loop 4000 times, File.DuplicateRow can spend 90-105s !!!

Describe the results you expected: Maybe it's time to create a File.BunchRow(sheetName string, row int, n int) method. This new method can be create a single deepCopy of row and apply it for n rows inserted!

Remember: File.InserRow (adjustHelper internaly) is absurd faster than that.

[xuri]

Sorry for my late reply. If you want to set the styles for multiple rows to keep format and styles, using the SetRowStyle function will get better performance.