cubicweb #16055814 the TreeView does not work properly when used in a tab [validation pending]

besides, it looks over complexified (eg initial_thru_ajax stuff)

prioritynormal
typebug
done in3.24.0
load left0.000
closed by#9f7949b63ab2 [views] simplify and fix the TreeView (closes #16055814)
patch[views] simplify and fix the TreeView (closes #16055814) [applied]