Moves child to a new position in the list of box children.
The list is the children field of
GtkBox, and contains both widgets packed GTK_PACK_START
as well as widgets packed GTK_PACK_END, in the order that these
widgets were added to box.
A widget's position in the box children list determines where
the widget is packed into box. A child widget at some position
in the list will be packed just after all other widgets of the
same packing type that appear earlier in the list.
Moves child to a new position in the list of box children. The list is the children field of GtkBox, and contains both widgets packed GTK_PACK_START as well as widgets packed GTK_PACK_END, in the order that these widgets were added to box. A widget's position in the box children list determines where the widget is packed into box. A child widget at some position in the list will be packed just after all other widgets of the same packing type that appear earlier in the list.