What are you mind? Why can’t I use a wrap?
I partially solved this problem  by replacing  “rowHeight: ‘auto’ ” with  “rowHeight: 50 ” .
 
But in this case, the indent is lost : next levels do not have an indent and stand in the same position as the zero level. Could you tell me where the indent changes and which variable is responsible for it?
  https://www.dropbox.com/s/f0uf7ipytt9xjwa/with%20indent.png?dl=0
 
https://www.dropbox.com/s/j0720gnm42fuhr1/no%20indent.png?dl=0https://www.dropbox.com/s/j0720gnm42fuhr1/no%20indent.png?dl=0