Private Sub Workbook_Open()
Application.ScreenUpdating = False: Dim L%
With Sheets("Feuil1")
For L = Range("A65536").End(xlUp).Row To 2 Step -1
If Cells(L, 1) <> "" And Cells(L - 1, 1) <> "" Then
If Cells(L, 1) <> Cells(L - 1, 1) Then Cells(L, 1).EntireRow.Insert
End If
Next
End With
End Sub