How to auto-size height of merged rows in HSSFSheet?

I have a merged rows inside HSSFSheet And I trying to set row's height automatically this way:

 borderedStyle.setWrapText(true);
 row.setHeight((short)-1);

whole code is here https://gist.github.com/iva-nova-e-katerina/ad3011adb78d6d16d7b6a15d2db7fbd3 It works fine for some rows but not for merged ones. Please help me to auto-size for example tenth row. Thank you!