I attach a test here: 3 children are created under the root

1.
*) click on the child-0, it is selected
*) click on the open/close arrow of child-1, the selection is not changed, always child-0

2.
*) close the child-0, select child-1
*) click on the arrow of child-0 to open it, the selection is still child-1,
*) click on the arrow of child-0 to close it, the selection becomes child-0 and child-1,

3.
repeat 2) but replace child-1 by child-2, the selection is not changed.