Hi Tomasz,
Thank you for the details.
As you said, if WrapText is set to true, the row height does not return the correct height or it returns the previous height. Essential XlsIO does not have the option to re-calculate the RowHeight up on toggling WrapText. We have logged a feature request for this and will update you once it is available.
Meanwhile, you could calculate the approximate height of the cell using our helpher class that then set it as the row height. Please refer to the sample demonstrating this in the below link:
http://websamples.syncfusion.com/samples/XlsIO.Windows/F77968/main.htmBut this will return the approximate height and it will not be absolute.
Please let me know if you have any questions.
Regards,
Geetha