Unmerged cells are still considered merged and cannot be written
*Created originally on Bitbucket by [DKhalaan (Guillaume)](https://bitbucket.org/%7B8c5cb18e-ee4d-495c-82a4-6ed4299b589a%7D/)*
When writing into a cell that used to belong to a merged cell, the application throws an error:
AttributeError: 'MergedCell' object attribute 'value' is read-only
Sample Excel file contains a unique merged cell [A1:B2]
Error is displayed when the script tries to write into the previously merge cell 'B2'
Worksheet.unmerge_cells(start_row=1, start_column=1, end_row=2, end_column=2)
Worksheet.cell(2,2).value = "TOTO"
It seems that openpyxl still consider the cells as part of a merged cell.
*Attachments:* [extract.py](/uploads/18a00cf356e65d2e23c0b0163d49a662/extract.py)[testUnmerge.xlsx](/uploads/3de9230a7993e32404abc719a018b31f/testUnmerge.xlsx)
issue