Created attachment 145227 [details]
Example file from Excel
If we set a pattern as a cell background in Microsoft Excel and open the file with LibreOffice Calc the pattern disappears, because there is no such function.
Steps to reproduce:
1. Create a new spreadsheet with Microsoft Excel 2010/2013/2016
2. Fill the A1 cell with a simple text and set a pattern as a cell background. (Right click on cell>Format cells>Background>Pattern style/Pattern color)
3. Save the file as *.xlsx
4. Open the file with LibreOffice Calc
The pattern disappears from the cell.
The pattern should not disappear from the cell.
Created attachment 145228 [details]
Screenshot of the file in Excel and Calc side by side
Confirmed on windows 7 x64 with Version: 188.8.131.52 (x64)
Build ID: 0c292870b25a325b5ed35f6b45599d2ea4458e77
CPU threads: 3; OS: Windows 6.1; UI render: default
*** This bug has been marked as a duplicate of bug 31205 ***