Applying fill to cell with a NamedStyle applies fill to all cells with NamedStyle
*Created originally on Bitbucket by [AlainPannetier](https://bitbucket.org/%7B81b5a938-f5ad-4d7e-9253-3bf90c5f3df5%7D/)* Simple test: ``` #!python #!/usr/bin/env python3 from openpyxl import Workbook from openpyxl.styles import NamedStyle, PatternFill, fills myStyle = NamedStyle(name="myStyle") wb = Workbook() ws = wb.active ws['A1'].value = 'A1' ws['A1'].style = myStyle ws['A2'].value = 'A2' ws['A2'].style = myStyle ws['A1'].fill = PatternFill(fill_type=fills.FILL_SOLID, fgColor='ff0000') # Result ==> A2 has red background too wb.save("test.xlsx") ``` *Attachments:* [test.xlsx](/uploads/2aa45ce8a1daa8a74e0e9b0d5a31cd69/test.xlsx)[test01.py](/uploads/5c2e32529b53ae73bf02e6fbffa9a581/test01.py)
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