QXlsx
                                
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                        Conditional formatting fails saving "format"
Hello,
when I try to run the "conditional formatting" example:
    ConditionalFormatting cf1;
    Format fmt1;
    fmt1.setFontColor(Qt::green);
    fmt1.setBorderStyle(Format::BorderDashed);
    cf1.addHighlightCellsRule(ConditionalFormatting::Highlight_LessThan, "40", fmt1);
    cf1.addRange("B3:B21");
    xlsx.addConditionalFormatting(cf1);
... saved file cannot be opened by Excel without error. I can see that the conditional format type is correct (ie Highlight_LessThan) and the formula too ("40"). However, the associated format fails. Opening the xlsx archive, file "xl/styles.xml", I have the impression that the format is not saved in the 
Do I miss something ? Thanks in advance.
Dear @Julieng031
Sorry for the late reply. I created a repository for testing. https://github.com/JayTwoLab/qxlsx-issues-155 Can you make a pull request for testing?
I tried to do it. First time I add code on GitHub, hope I did it well !