TREEVIEW display issue

[Erika]

In TREEVIEW display, when going back to preview view, in some case, display doesn't begin by the first line.
See screenshots :
1. Upper level, before opening my UTILS directory
2. The beginning of my UTILS directory
3. Scrolling down to my UTILS directory
4. Going back to upper level : the display is scrolled down too and doesn't begin by the first line.

Thanks for your great job !